Tafsir of Al-Mu'minoon 23:2

(Who are humble in their prayers…) [23:2]. ‘Abd al-Rahman ibn Ahmad al-‘Attar informed us> Muhammad ibn ‘Abd Allah ibn Nu‘aym> Ahmad ibn Ya‘qub al-Thaqafi> Abu Shu‘ayb al-Harrani> his father> Isma‘il ibn ‘Uliyyah> Muhammad ibn Sirin> Abu Hurayrah who reported that the Messenger of Allah, Allah bless him and give him peace, used to look toward the sky in his prayer, and so this verse was revealed (Who are humble in their prayers).