Musannaf Ibn Abi Shaybah

Hazrat Muwarriq Ajli says that I have not seen anyone more cautious in his jurisprudence than Muhammad (may Allah have mercy on him), nor anyone more knowledgeable in jurisprudence in his cautiousness. Hazrat Abu Qilabah says: Wherever you turn him, you will find him the most cautious and the one who has the greatest control over his own self among you.