Musnad Ahmad 535:6

Hajjaj narrated to us, he said: Al-Layth ibn Sa’d narrated to us, he said: Yazid ibn Abi Habib narrated to us, that he heard Abdullah ibn al-Harith al-Zubaydi saying: "I am the first one who heard the Prophet, may Allah bless him and grant him peace, saying: 'None of you should urinate while facing the Qiblah.' And I am the first one who told the people about that."