Musnad Ahmad 1007:44

Hassan ibn Musa and Musa ibn Dawud narrated to us, they said: Ibn Lahi'ah narrated to us, Abu al-Zubayr narrated to us, from Jabir, from Abu Qatadah, that he saw the Messenger of Allah (may Allah bless him and grant him peace): "Urinate while facing the Qiblah." Ishaq, meaning Ibn al-Taba', narrated to us the like of it. He said: Abu Qatadah informed me.