Abu Sa’eed (RA) reported that Allah’s Messenger (SAW) said, “How may I rest while the one with the trumpet has put it into his mouth, alerted the ear (to hear) when he will be commanded to blow it?” It was as though heavy on the sahabah of the Prophet (SAW) , so he said to them that they should recite: (Sufficient to us is Allah and an excellent guardian He is. We place our trust in Allah.)
[Ahmed 11039]