Narrated Ibn'`Umar: When the Prophet put his feet in the stirrup and the she-camel got up carrying him he would start reciting Talbiya at the mosque of Dhul-Hulaifa.
Hadith Referenceصحيح البخاري / كتاب الجهاد والسير / 2865
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة