Hasan narrates that Hazrat Bilal once gave the call to prayer (adhan) at night. The Messenger of Allah (peace and blessings be upon him) instructed him to go and announce that the servant has fallen asleep! He went back and made this announcement that the servant has fallen asleep. Along with this, he was reciting this verse: "If only Bilal’s mother had never given birth to him, and if only his forehead had been soaked with blood." The narrator says that we have also learned that the Messenger of Allah (peace and blessings be upon him) instructed him to repeat the adhan.