Musnad Abu Ya'la al-Mawsili 148:17

Muhammad ibn Ishaq al-Musayyibi narrated to us, Yazid ibn Harun narrated to us, from al-Ala’ ibn Muhammad al-Thaqafi, who said: I heard Anas ibn Malik saying: We were with the Messenger of Allah (may Allah bless him and grant him peace) at Tabuk. The sun rose with a radiance, rays, and light the likes of which I had not seen it rise with in the past. Gabriel came to the Prophet (may Allah bless him and grant him peace), so he said: "O Gabriel, why do I see the sun today rising with a radiance, light, and rays the likes of which I have not seen it rise with in the past?" He said: "That is because Mu'awiyah ibn Mu'awiyah al-Laythi died in Medina today, so Allah sent down to him seventy thousand angels to pray over him." He said: "And for what reason is that?" He said: "He used to recite 'Say, He is Allah, [who is] One' (Surah al-Ikhlas) frequently, by night and by day, while walking, standing, and sitting. Would you like, O Messenger of Allah, for me to fold the earth for you so that you may pray over him?" He said: "Yes." So he prayed over him.