(15) باب مَنِ انْتَظَرَ الإِقَامَةَ
Narrated `Aisha:
Allah's Messenger (ﷺ) used to pray two light rak`at before the morning (compulsory) prayer after the day dawned and the Mu'adh-dhin had finished his Adhan. He then would lie on his right side till the Mu'adh-dhin came to pronounce the Iqama.
Reference: Sahih al-Bukhari 626
In-book reference: Book 10, Hadith 23
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 11, Hadith 599