Sahih al-Bukhari 4569
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
Allah's Statement: "Verily! In the creation of the heavens and the earth, and in the alternation of night and day, there are indeed signs for men of understanding." (V.3:190)
Narrated Ibn `Abbas: I stayed overnight in the house of my aunt Maimuna. Allah's Messenger (ﷺ) talked with his wife for a while and then went to bed. When it was the last third of the night, he got up and looked towards the sky and said: "Verily! In the creation of the Heavens and the Earth and in the alteration of night and day, there are indeed signs for men of understanding." (3:190) Then he stood up, performed ablution, brushed his teeth with a Siwak, and then prayed eleven rak`at. Then Bilal pronounced the Adhan (i.e. call for the Fajr prayer). The Prophet (ﷺ) then offered two rak`at (Sunna) prayer and went out (to the Mosque) and offered the (compulsory congregational) Fajr prayer.