Abu Bakr ibn Abi Shaybah: He used to narrate to every person a noble hadith
Abu Hatim al-Razi: Thiqah (Trustworthy), Saduq (Truthful)
Abu Isa al-Tirmidhi: Thiqah (Trustworthy), Hafiz (One with strong memory)
Ahmad ibn Hanbal: We used to criticize Abd al-Salam for something. He would not say "He narrated to us" except in one or two hadiths.
Ahmad ibn Shuayb al-Nasa'i: There is nothing wrong with him
Ahmad ibn Salih al-Jili: According to the people of Kufa, he is trustworthy and reliable, while the people of Baghdad find some of his hadiths strange. The people of Kufa know him better
Ibn Hajar al-Asqalani: Thiqah (Trustworthy), Hafiz (One with strong memory), he has some Munkar (rejected) hadiths, and he has two hadiths in Bukhari as a supporting narration
Al-Daraqutni: In the questions of Abu Abd al-Rahman al-Salami, he said: Thiqah (Trustworthy). In the questions of al-Hakim, he said: Thiqah (Trustworthy), Hujjah (Strong)
Al-Dhahabi: Thiqah (Trustworthy)
Abd al-Salam ibn Numayr: He used to commit Tadlis (concealing a defect in the chain of narration)
Muhammad ibn Ismail al-Bukhari: Saduq (Truthful)
Muhammad ibn Sa'd, the author of al-Waqidi: He has weakness in hadith
Muhammad ibn Abd Allah al-Makhrami: I knew him. Al-Aqili said, "Whenever he said 'I knew him', he would destroy him." And once: "My legs cannot carry me to him."
Wakee' ibn al-Jarrah: Every hadith is Hasan (Good), Abd al-Salam ibn Harb narrated it
Yahya ibn Ma'in: Saduq (Truthful). And once: There is nothing wrong with him, his hadith can be written. And once: Ibn Fadil is dearer to me than Abd al-Salam. Abd al-Salam ibn Harb is good in narration from the people of Kufa. In the narration of Ibn Mahriz, it was said to him, "Is he Thiqah (Trustworthy)?" He said: Yes
Yaqub ibn Shaybah al-Sudosi: Thiqah (Trustworthy), his hadith is lenient