With respect to his morality and ethical excellence, Ibne-Hajar writes,
"The patience and forbearance of Imam Moosa al-Kazim(as) was such that he was given the title of Al-Kazim (one who swallows his anger). He was the embodiment of virtue and generosity. He devoted his nights to the prayers of God and his days to fasting. He always forgave those who did wrong to him."