Imām Bukhārī narrates: Mūsā ibn Ismā'īl narrated to us, he said: 'Abdul-Wāhid narrated to us, he said: Al-Shaibānī narrated to us, he said: 'Abdur-Rahmān ibn al-Aswad narrated to us, from his father, from 'Ā'ishah, may Allāh be pleased with her, she narrated that:

there were two rak'ahs which the Messenger of Allāh ﷺ never left, neither secretly nor openly: two rak'ahs before the obligatory Fajr prayer, and two rak'ahs after the obligatory 'Asr.