Musannaf Ibn Abi Shayba 1:1138

1138. Ubayd Allah ibn Musa narrated to us, he said: Ismail ibn Abd al-Malik informed me, from Abu al-Zubayr, from Jabir, he said: I went out with the Messenger of Allah, may Allah bless him and grant him peace, on a journey. The Messenger of Allah, may Allah bless him and grant him peace, would not go to relieve himself until he went out of sight so that he would not be seen.