It is narrated from Sayyiduna Hakim bin Hizam (may Allah be pleased with him), he says: I said: "O Messenger of Allah! The incantations with which we seek healing and the medicines with which we treat ourselves, can they avert anything of the decree of Allah?" He (peace and blessings be upon him) said: "They too are part of the decree of Allah."

Sayyiduna Abu Burdah came to Sayyidah Aishah (may Allah be pleased with her) and said: "O mother! Tell me something you heard from the Messenger of Allah (peace and blessings be upon him)." She said that the Messenger of Allah (peace and blessings be upon him) said: "Birds (taken as omens) fly only according to the decree of Allah," and he (peace and blessings be upon him) liked a good omen. The two Shaykhs used all the narrators of this hadith as evidence except Yusuf bin Abi Burdah, and in my view they did not leave him out due to any criticism or weakness, but rather due to the scarcity of his narrations, for his hadiths are very rare.