Mujālid reported, through al-Shaʿbī, from Masrūq, who said:
“I met ʿUmar, and he asked, ‘What is your name?’
I replied, ‘Masrūq son of al-Ajdaʿ.’
He said, ‘I heard the Prophet ﷺ say, “Al-Ajdaʿ is a devil(1).” You are Masrūq son of ʿAbd al-Raḥmān.’”
Al-Shaʿbī added: “I later saw his name written in the administrative register(2) as ‘Masrūq son of ʿAbd al-Raḥmān.’”

Mālik ibn Mighwal said: “I heard Abū al-Safar, from Murrah, say, ‘No woman of Hamdān has ever given birth to anyone like Masrūq.’”

Ayyūb al-Ṭāʾī, on the authority of al-Shaʿbī, said: “To my knowledge, no one in any region was more avid in seeking knowledge than Masrūq.”

Mansūr, on the authority of Ibrāhīm, said:
“The companions of ʿAbd Allah who used to teach the people the Quran and instruct them in the Sunnah were: ʿAlqamah, al-Aswad, ʿUbaydah, Masrūq, al-Ḥārith ibn Qays, and ʿAmr ibn Shuraḥbīl.”

ʿAbd al-Malik ibn Abjar reported from al-Shaʿbī:
“Masrūq was more knowledgeable in issuing legal rulings than Shurayḥ, whereas Shurayḥ was more knowledgeable in judiciary matters than Masrūq. Shurayḥ would consult Masrūq, but Masrūq would not consult Shurayḥ.”

Shuʿbah narrated from Abū Isḥāq:
“Masrūq performed the pilgrimage and never slept except in prostration, his face on the ground, until he returned.”

Anas ibn Sīrīn transmitted from Masrūq’s wife, who said:
“Masrūq would pray until his feet became swollen; I would sometimes sit and weep at what I saw him doing to himself.”

Al-Muthannā al-Qaṣīr related, on the authority of Muḥammad ibn al-Muntashir, from Masrūq:
“I was with Abū Mūsā during the days of the two arbiters; my tent was pitched beside his, and one morning the people …”