He would recite it with such a doleful and fine voice that...
He would recite it with such a doleful and fine voice that people would gather around his residence to listen to his recitation tearfully and earnestly. There were some malevolent people who would curse him and his noble ancestors and say rude words to him. Encountering them with patience and tolerance, however, he would guide them and draw their attention to the moral rectitude and virtue. Some anecdotes in this respect have been historically recorded.
The nickname Kazim, meaning the one who restrains [and suppresses] his anger, is rooted in these events. That was his treatment of those who, out of ignorance or being instigated by the enemies, committed indecent and vile actions toward him. His wise and tolerant behavior gradually made the rightfulness of the Infallible (as) clear and evident to them.
However, whenever it so happened that the word of Truth was to be expressed against a tyrant caliph or sultan, Imam Musa al-Kazim (as) would say: “Speak out the Truth even if it leads to your perishing.” Truth is so highly valued that people could be sacrificed to preserve it. He was a paradigm of humbleness, as he was in his other competent traits.
He would associate with poor, soothe and comfort the helpless, consider the slave and the free as equal, and would say: “We are children of Adam and created by the One God.” Abu Hanifa is quoted as saying: “I saw him in his childhood and asked him some questions to which he gave such answers as if he had been nurtured from the fountainhead of Wilayat . Imam Musa b. Ja‘far (as) was indeed a learned and competent jurist and a skilful and authoritative orator.” Similarly Muhammad b.
Nu‘man said: “I viewed Musa b. Ja‘far as a vast and fathomless ocean that was effervescing and dispersing seeds of knowledge around.” Imam al-Kazim (as) in the Bastion of Teaching Truths and Struggle The promulgation of the Ja‘fari jurisprudence and ethics as well as exegesis and theology which had commenced since the time of Imam al-Sadiq (as) and throughout the era of Imam Muhammad al-Baqir (as), was carried on in the time of Imam Musa al-Kazim (as), who followed the footsteps of his noble ancestors to make people more and more familiar with the straight line of Imamate and the truth of Ja‘fari school of thought; and to hand over this glowing torch through ages to the coming generations.