Volume 2, Book 22, Number 293:
Narrated Sahl bin Sad:
The Prophet went out to affect a reconciliation between the tribes of Bani ‘Amr bin ‘Auf and the
time of the prayer became due; Bilal went to Abu Bakr and said, “The Prophet is detained. Will you
lead the people in the prayer?” Abu Bakr replied, “Yes, if you wish.” So Bilal pronounced the Iqama
and Abu Bakr led the prayer. In the meantime the Prophet came crossing the rows (of the praying
people) till he stood in the first row and the people started clapping. Abu Bakr never looked hither
and thither during the prayer but when the people clapped too much, he looked back and saw the
Prophet in the (first) row. The Prophet waved him to remain at his place, but Abu Bakr raised both
his hands and sent praises to Allah and then retreated and the Prophet went forward and led the
prayer. (See Hadith No. 295 & 296)