Musnad Ahmad 1153:1881

Abu Kamil narrated to us, he said: Hammad narrated to us, from Khalid al-Hadhdha’, from Khalid ibn Abi al-Salt, that ‘Arak ibn Malik narrated in the presence of ‘Umar ibn ‘Abd al-‘Aziz, that ‘Aisha said: It was mentioned to the Messenger of Allah, may Allah bless him and grant him peace, that some people dislike facing the Qibla with their private parts. He said: "Have they really done that? Turn my seat towards the Qibla."