Musannaf Ibn Abi Shayba 22:368

Sufyan ibn 'Uyaynah narrated to us, from 'Abd al-Karim, from 'Amr ibn Shu'ayb, who said: When a boy from the Banu 'Abd al-Muttalib began to speak clearly, the Prophet, may Allah bless him and grant him peace, would teach him this verse seven times: "Praise be to Allah, who has not taken a son, has had no partner in sovereignty, and has had no protector out of weakness, and glorify Him with [great] glorification."