Yahya related to me from Malik that Humayd ibn Qays al-Makkisaid, "A man came to the Messenger of Allah, may Allah bless him andgrant him peace, with the two sons of Jafar ibn Abi Talib. He said totheir nursemaid, 'Why do I see them so thin?' Their nursemaid said,'Messenger of Allah, the evil eye goes quickly to them. Nothing stopsus from asking someone to make incantations (using ayats of Qur'an)for them, except that we do not know what of that would agree withyou.' The Messenger of ,Allah, may Allah bless him and grant himpeace, said, 'Make incantations for them. Had anything been able toprecede the decree, the evil eye would precede it.' "
USC-MSA web (English) reference: Book 50, Hadith 3
Arabic reference: Book 50, Hadith 1716