Praise be to Allah,
Ismaa’eel ibn Ibraaheem narrated to us from ‘Abdul-‘Azeez ibn Shuhayb from Anas ibn Maalik said,
“[Once] the Iqaamah for prayer was called while Allah’s Messenger (PBUH) was talking to a man [in a low voice] in the mosque, and he did not get up to [lead] the prayer until the people dosed off [in a sitting posture].”
(Musnad Ahmad, Vol. 3, p. 101. The isnaad of this hadeeth is Saheeh. according to the conditions set by al-Bukhaaree and Muslim.)
Note: Iqaaamah is the shorter call to prayer that is immediately made just prior to five obligatory prayers to let people know that prayer is about to begin
Al Bukhari narration mentions that only some of the people dozed off.
Source:
Thulaathiyyaat Musnad Ahmad ibn Hanbal (may Allah have mercy on him)
Reports of Imaam Ahmad that have only three narrators between him and the Prophet, peace, and blessings be upon him.
Shaykh Muhammad ibn Ahmad ibn Saalim as–Saffaareenee al–Hanbalee ~(1114 –1188 AH)