And ʿAbd al-Raḥmān ibn Abī al-Zinād transmitted, on the authority of his father, who said:
“I have never seen anyone more versed in the Sunnah than al-Qāsim ibn Muḥammad. In our view, a man was not even regarded as a man until he knew the Sunnah. Nor have I seen anyone quicker of mind than al-Qāsim; he would laugh at the people of dubious speculations the way a youth laughs.”

Khalid ibn Nizār reported from Ibn ʿUyaynah, who said:
“The most knowledgeable of people concerning ʿĀʾishah’s hadiths are three: al-Qāsim, ʿUrwah, and ʿAmrah.”

Jaʿfar ibn Abī ʿUthmān said: I heard Yaḥyā ibn Maʿīn remark,
“ʿUbayd Allāh ibn ʿUmar—from al-Qāsim—from ʿĀʾishah: a chain interwoven with gold.”

Ibn ʿAwn said: “Al-Qāsim, Ibn Sīrīn, and Rajāʾ ibn Ḥaywah would narrate hadith word for word, whereas al-Ḥasan, Ibrāhīm, and al-Shaʿbī would convey them according to their meaning (1).”

Yūnus ibn Bukayr, on the authority of Ibn Isḥāq, related:
“I saw al-Qāsim ibn Muḥammad while he was praying, and a Bedouin came up and asked, ‘Which of you is more learned, you or Sālim?’
He replied, ‘Exalted is Allah! Each of us will inform you of what he knows.’
The man insisted, ‘But which of you two is the more knowledgeable?’
He said, ‘Exalted is Allah!’
When he repeated the question, al-Qāsim said, ‘That is Sālim; go to him and ask,’ and he rose and left.

Ibn Isḥāq commented: ‘He disliked saying, “I am more knowledgeable,” for that would be self-commendation; nor did he wish to say, “Sālim is more knowledgeable than I,” for that would be a lie. Al-Qāsim was, in fact, the more learned of the two.’”

Ibn Wahb said: “Mālik mentioned al-Qāsim ibn Muḥammad and said, ‘He was among the jurists of this—’