Sayyiduna Ammar bin Yasir (may Allah be pleased with him) narrates: After the prohibition of (facing the qiblah while) defecating or urinating, I saw the Prophet (peace and blessings be upon him) facing the qiblah (while urinating).
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains a narrator, Ja'far bin al-Zubayr, whose weakness the hadith scholars agree upon.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الطهارة / 1013