Sahih Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Volume: 005 / Book Number: 059 / Hadith Number: 635
Narrated Amr bin Maimuin:
When Mu'adh arrived at Yemen, he led them (i.e. the people of Yemen) in the Fajr prayer wherein he recited: 'Allah took Abraham as a Khalil.' A man amongst the people said, "(How) glad the mother of Abraham is!" (In another narration) 'Amr said, "The Prophet sent Mu'adh to Yemen and he (led the people) in the Fajr prayer and recited: 'Allah took Abraham as a Khalil. A man behind him said, "(How) glad the mother of Abraham is!"