Abu Ahmad ibn Adi al-Jurjani: Denier of Hadith, and some of his Hadith are not corroborated
Abu Bakr al-Bayhaqi: Denier of Hadith
Abu Zar'ah al-Razi: Feeble in Hadith
Ibn Hajar al-Asqalani: Weak
al-Daraqutni: Weak
Muhammad ibn Ismail al-Bukhari: Weak in Hadith, senile, and once: Denier of Hadith