Musannaf Ibn Abi Shayba 3:351

Abu Bakr narrated to us, he said: Abd al-Aziz ibn Muhammad al-Darawardi narrated to us, from Ismail ibn Abi Habibah, from Abdullah ibn Abd al-Rahman, he said: The Prophet (ﷺ) came to us and prayed with us in the mosque of Banu Abd al-Ashhal. I saw him placing his hands inside his garment when he prostrated.