Abu Ahmad Al-Hakim: He is not strong (reliable) according to them
Abu Ahmad ibn 'Adi Al-Jurjani: People criticized him only for his Tadlis on Az-Zuhri and others, and he may have made mistakes in some narrations. As for intentionally lying, no, he is among those whose Hadiths are written down
Abu Bakr Al-Bazzar: He was a Hafiz (scholar who memorized a vast amount of Hadiths) and Mudallis (narrator who practices Tadlis) and he was conceited
Abu Bakr Al-Bayhaqi: He is not relied upon. He once said: Weak. And he once said: Known for Tadlis
Abu Ja'far An-Nahaas: He practices Tadlis from those he met and those he did not meet, so his narration is not considered evidence unless he says 'Hadathana' or 'Akhbarana' or 'Sami'tu'
Abu Hatim Ar-Razi: Truthful, he practices Tadlis from weak narrators, his Hadiths are written down. If he says 'Hadathana' then it is acceptable, there is no doubt about his truthfulness and memorization if he clarifies hearing (the Hadith). However, his Hadith is not taken as evidence if he did not hear it from Az-Zuhri, Hisham ibn 'Urwah, or 'Ikrimah. And once he said: Al-Hajjaj was a Mudallis from those he saw and those he did not see, and he would say if you narrated something to me from a Sheikh, I wouldn't mind.
Abu Hatim ibn Hibban Al-Busti: He was righteous, Ibn Al-Mubarak, Ibn Mahdi, Yahya Al-Qattan, Yahya ibn Ma'in, and Ahmad ibn Hanbal abandoned narrating from him. Adh-Dhahabi said: This statement is an exaggeration. Most of what he was criticized for was Tadlis, and he had a pride that is not befitting of people of knowledge
Abu Zur'ah Ar-Razi: Truthful, Mudallis
Abu 'Abd Allah Al-Hakim An-Naysaburi: He is not relied upon
Abu Muhammad ibn Hazm Adh-Dhahiri: A weak narrator
Abu Mu'ti Al-Balkhi: I saw Al-Hajjaj ibn Artah wearing black, so I did not write from him
Ahmad ibn Hanbal: He was among the Huffaz (plural of Hafiz). It was said: Then why is he not considered so by the people? He said: Because his Hadiths have additions compared to the Hadiths of others. There is hardly a Hadith of his that does not have an addition. And once he said: They say he did not meet Az-Zuhri, and he narrated from men he did not meet. And once he said: I heard Yahya ibn Ma'in mention that Hajjaj did not see Az-Zuhri, and he had a very bad opinion of him.
Ahmad ibn Shu'ayb An-Nasa'i: Weak, his Hadiths are not taken as evidence, he is not strong
Ahmad ibn Salih Al-Jili: He was a Faqih (scholar of Islamic jurisprudence) and was one of the Muftis of Kufa, and he had pride. He was a permissible narrator, except that he was a practitioner of Irsal (narrating a Hadith without mentioning the name of the Sheikh from whom he heard it). Then he said: People only criticize him for Tadlis.
Ibrahim ibn Ya'qub Al-Jawzajani: Be cautious with his Hadiths
Isma'il ibn Ishaq Al-Qadi: His Hadiths are unreliable due to the frequency of his Tadlis
Ibn Hajar Al-'Asqalani: One of the Fuqaha (plural of Faqih), he is truthful with many mistakes and Tadlis. A weak Mudallis. And once he said: There is weakness in him
Al-Khatib Al-Baghdadi: Al-Hajjaj is one of the scholars of Hadith and Huffaz. He was a Mudallis who narrated from those he did not meet.
Ad-Darqutni: Weak, he is not relied upon
Adh-Dhahabi: Most of what he was criticized for was Tadlis, and he had a pride that is not befitting of people of knowledge. And once he said: One of the flags (prominent scholars), though there is leniency in him
Hammad ibn Zayd Al-Jahdami: Al-Hajjaj is more eloquent in Hadith than Sufyan Ath-Thawri. He was considered by us more knowledgeable in Hadith than Sufyan Ath-Thawri.
Hammad ibn Salamah Al-Basri: By Allah, he was pleasant and refined
Zakariya ibn Yahya As-Saji: He was a Mudallis, truthful, with a bad memory, not considered evidence in Furu' (branches of Islamic law) and Ahkam (rulings)
Sibṭ ibn Al-'Ajami: Known for narrating from weak narrators
Sufyan Ath-Thawri: I have not seen anyone with a better memory than him. You should learn from him, for there is no one left who knows what he knows by heart. And once he said: I have not seen anyone like him
Shu'bah ibn Al-Hajjaj: If you want Hadith, then stick to Al-Hajjaj ibn Artah. And once he said: Trustworthy
Abd Ar-Rahman ibn Yusuf ibn Kharash: He was a Mudallis and was a Hafiz of Hadith
Abdullah ibn Abi Najih Al-Makki: No one like him came to us
Abdullah ibn Idris Al-Kufi: I used to see Al-Hajjaj ibn Artah mending his clothes, then he went out to Al-Mahdi and arrived with him with forty camels carrying their loads
Abd Al-Malik ibn Qurayb Al-Asma'i: The first of the judges in Basra to accept bribes was Al-Hajjaj ibn Artah
Ali ibn Al-Madini: I intentionally abandoned him
Isa ibn Yunus As-Sabi'i: Al-Hajjaj ibn Artah would not attend the congregational prayer, so he was asked about that, and he said: When do porters and grocers not crowd this mosque of yours?
Muhammad ibn Ishaq ibn Khuzaymah: I do not rely on him except in what he said 'Akhbarana' and 'Sami'tu'
Muhammad ibn Isma'il Al-Bukhari: What he narrated with 'Hadathana' is acceptable
Muhammad ibn Sa'd, the scribe of Al-Waqidi: Weak
Muhammad ibn Abdullah Al-Makhrami: He was a Mudallis. He narrates to us from 'Amr ibn Shu'ayb what Muhammad Al-'Arzami narrates, and Al-'Arzami is abandoned, we do not approach him. Ibn Al-Mubarak said: I said to Hisham: Why do you practice Tadlis when you have heard directly? He said: There were two great scholars who practiced Tadlis. He mentioned Sufyan Ath-Thawri and Al-A'mash. He mentioned that Al-A'mash did not hear from Mujahid except four Hadiths, and that Al-Hajjaj ibn Artah did not...
Muhammad ibn 'Amr At-Tanuri: A respectable friend of Al-Hajjaj sent his son to him to plead his case in the court session. He ordered him to be imprisoned, so the policeman said to him: What should I write as the reason for his imprisonment? He said: Write: Imprisoned by the judge
Muhammad ibn Nasr Al-Marwazi: The majority of his narrations are Irsal, Tadlis, and changing of words
Muhyi ad-Din An-Nawawi: They agreed that he was a Mudallis, and the majority considered him weak, so they did not rely on him. He was skilled in memorization and knowledge
Authors of Tahrir Taqrib At-Tahdhib: Truthful, his Hadiths are good, Mudallis
Yahya ibn Abi Zayd Al-Kufi: It was ordered to abandon his Hadiths. And once: I heard Al-Hajjaj ibn Artah say: It was ordered that the doors be closed. And he said: I did not hear anything from Az-Zuhri, and I did not hear from Ash-Sha'bi except one Hadith, and I did not hear from so-and-so until he counted seventeen
Yahya ibn Sa'id Al-Qattan: I intentionally abandoned Al-Hajjaj and did not write any Hadith from him. And once: Unreliable. And once: I saw Al-Hajjaj ibn Artah giving Fatwas in Mecca, so I did not take from him, nor did I take from a man who narrated from him because he was unreliable. And once: Hajjaj ibn Artah and Muhammad ibn Ishaq are the same to me
Yahya ibn Ma'in: Ahmad ibn Zuhayr said about Yahya ibn Ma'in: Weak, weak. And once: Truthful, not very strong, he practices Tadlis from Muhammad ibn 'Ubayd Allah Al-'Arzami from 'Amr ibn Shu'ayb. And once: He is not that strong, he is like Ibn Abi Layla and Mujalid. And once: His Hadiths are not taken as evidence. And once: 'Abbas ibn Muhammad said to Yahya ibn Ma'in: What does Al-Hajjaj mean by saying: Attribute to...?'
Ya'qub ibn Sufyan Al-Faswi: Acceptable Hadiths
Ya'qub ibn Shaybah As-Suddusi: Weak narrator, his Hadiths are unreliable. People criticized him. And he said: His Hadiths are weak, there are many contradictions in his Hadiths, and he was truthful, and he was one of the Fuqaha