Al-Hasan ibn Musa al-Wesha (of Baghdad) narrated:
In Khurasan, I, once, was with Ali ibn Musa ar-Ridha (a) while he was delivering a sermon in a session. Zaid ibn Musa —his brother— was
attendant, but he was addressing words of pride to a group of the attendants.
As the Imam (a) heard Zaid’s words, he t urned to him and said: “Zaid, do
you, because you have heard my wording in Kufa that Allah forbids Hell to consume the offspring of Fatima (a) since she preserved her chastity, take pride against others? By Allah I swear, my previous wording is peculiar to al-Hasan, al-Hussein, and the other direct descendants of Fatima (a). You are too humble, in the sight of Allah, to be regarded, on the Day of Resurrection, as same as Musa ibn Ja’far —Imam al-Kadhim (a); the father of Imam ar-Ridha and Zaid the addre ssee— who used to spend his days with fasting and spend his night with worship to Allah while you act disobediently to Him. Ali ibn al-Hussein —Imam as-Sejjad (a)— used to say, ‘One who belongs to us and does righteously will be rewarded twice as others, and one who belongs to us and acts evilly will be punished twice as others.’”
Imam ar-Ridha (a) then turned towards me and asked about the way we recite Allah’s saying:
“His Lord replied, "He is not one of your family. He is a man of unrighteous deeds. Do not ask me about that which you have no knowledge. I advise you not to become an ignorant person." (11:46)”
I answered that some people recite it in a way showing that son of Prophet Noah was illegitimate, while others recite it in a way showing that he was his son, but he used to act unrighteously.
The Imam (a) commented: “No, by Allah. That son was Noah’s. But Allah dismissed him from the family of Noah because he acted unrighteously. In the same manner, he who belongs to us in family relations but does not obey Allah is not belonged to us. So lon g as you obey Allah, you are one of us—the Ahl ul-Bayt.” ( Bihar ul-Anwar; (as quoted from Meaani al-Akhbar and Uyounu akhbar ir-Ridha) )