Indeed, I have not asked you to swear because I suspect you, but Jibrīl (Gabriel) came and told me that Allah Almighty is boasting about you before the angels

Mu‘āwiyah ibn Abi Sufyān (may Allah be pleased with him and his father) came upon a group of people sitting in a circle in the mosque and asked them about the purpose behind their gathering. They replied: We are remembering Allah. He (may Allah be pleased with him) asked them to swear that they had only gathered and sat for the purpose of remembering Allah, and they swore to him. Then he said to them, I have not asked you to swear because I suspect you or question your truthfulness. He, then, was informed about his status by the Prophet (may Allah's peace and blessings be upon him) and that no one was closer to him than he was, given the fact that his sister ’Umm Habībah was the Prophet's wife and that he was one of the scribes of the revelation, yet he did not narrate many Hadīths. He narrated to them that the Prophet (may Allah's peace and blessings be upon him) came out of his home one day and found them sitting in the mosque, remembering Allah and praising Him for guiding them to Islam and for bestowing favor upon them. He (may Allah's peace and blessings be upon him) asked them and demanded they swear, just as Mu‘āwiyah (may Allah be pleased with him) did with his companions. The Prophet (may Allah's peace and blessings be upon him) then informed them of the reason behind asking them and requiring them to swear, saying: Gabriel, the angel, (peace be upon him) came to him and informed him that Allah Almighty was boasting about you and taking pride in you before the angels; showing them your merit and the excellence of your deed and praising you in their presence.