Musannaf Ibn Abi Shayba 3:5964

Ya'la ibn 'Ubayd narrated to us, from Yahya ibn Sa'id, from Abu Bakr ibn Muhammad ibn 'Amr ibn Hazm, from 'Abbad ibn Tamim, from 'Abdullah ibn Zayd, who said: The Messenger of Allah (may Allah bless him and grant him peace) went out to the prayer ground (musalla) to seek rain. When he supplicated, he faced the Qibla and turned his cloak inside out.