Abu Bakr al-Bazzar: Declared him trustworthy
Abu Hatim al-Razi: Great, trustworthy
Abu Hatim ibn Hibban al-Busti: He was a righteous and virtuous sheikh
Ahmad ibn Hanbal: He was one of the best, I don't think there was anyone better than him in his time, and once: I love Rabah, I love his hadith and I love mentioning him
Ahmad ibn Shuayb al-Nasa'i: Trustworthy
Ahmad ibn Salih al-Jili: Trustworthy
Ibn Hajar al-'Asqalani: Trustworthy, virtuous
Al-Dhahabi: Trustworthy, pious, devout
Muhammad ibn Umar al-Waqidi: He had virtue and knowledge of the hadith of Ma'mar
Muslim ibn al-Hajjaj al-Naysaburi: Trustworthy