Abdullah bin 'Amr bin al-'Aas · Funerals (Kitab Al-Jana'iz)

The Prophet (ﷺ) said: If anyone visits a sick whose time (of death) has not come, and says with him seven times: I ask Allah, the Mighty, the Lord of the mighty Throne, to cure you, Allah will cure him from that disease.

When Zaid b. Harithah, Ja'far and 'Abd Allah b. Rawahah were killed, the Messenger of Allah (ﷺ) sat down in the mosque and grief was visible in his face. Then he (the narrator) mentioned the rest of the tradition.