Musnad Ahmad 1013:58

Rab'i ibn Ibrahim narrated to us, Abd al-Rahman ibn Ishaq narrated to us, from Abd al-Rahman ibn Mu'awiyah, from Ibn Abi Dhubab, from Sahl ibn Sa'd, who said: "I never saw the Messenger of Allah, may Allah bless him and grant him peace, raising his hands high while supplicating, neither on the pulpit nor elsewhere. He would not supplicate except by placing his hand level with his shoulders, and he would gesture with his finger, a gesture."