Musnad Ahmad Hadith 23910

It is narrated from Bilal (may Allah be pleased with him) that once he came to inform the Prophet Muhammad (ﷺ) about the Fajr prayer, but Aisha (may Allah be pleased with her) engaged him in some questioning until it became light and the brightness spread. Bilal (may Allah be pleased with him) got up and went to inform the Prophet Muhammad (ﷺ) about the prayer and kept informing him continuously, but the Prophet Muhammad (ﷺ) did not come out. After a little while, the Prophet Muhammad (ﷺ) himself came out and led the people in prayer. Then Bilal (may Allah be pleased with him) told the Prophet Muhammad (ﷺ) that Aisha (may Allah be pleased with her) had started asking him something, due to which the morning had begun, and then you also delayed coming out. The Prophet Muhammad (ﷺ) said, "I was performing the Sunnah of Fajr." He said, "O Messenger of Allah! By that time, the morning had become very bright." The Prophet Muhammad (ﷺ) said, "Even if the brightness had spread even more than that, I would still have performed them with full attention and beauty."