Musnad Ahmad 1153:1482

'Abd al-Wahhab al-Thaqafi narrated to us, he said: Khalid narrated to us, from a man, from 'Umar ibn 'Abd al-'Aziz, that he said: "I have not faced the Qiblah with my private parts since such and such a time." Then 'Arak ibn Malik narrated from 'Aishah: "That the Prophet, peace and blessings of Allah be upon him, ordered that his privy be faced toward the Qiblah when it reached him that the people disliked that."