Musnad Ahmad 1153:1620

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from Qatadah, from Mutarrif, from 'Aishah, that the Messenger of Allah, may Allah bless him and grant him peace, used to say in his prostration or his bowing: "Subbuh, Quddus, Lord of the angels and the Spirit."