عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: كَانَ الْمُؤَذِّنُ إِذَا سَكَتَ مِنْ صَلَاةِ الصُّبْحِ صَلَّى رَكْعَتَيْنِ خَفِيفَتَيْنِ تَعْنِي النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ
Sayyidah Aisha (may Allah be pleased with her) says that when the muezzin would become silent after the Fajr adhan, the Noble Prophet (peace and blessings be upon him) would offer two light rak‘ahs.