Jami` at-Tirmidhi Book 47, Hadith 337
"We were with the Messenger of Allah (ﷺ) in Mina, when the moon was cleft asunder into two parts. Part of it was behind the mountain, and part of it before it. The Messenger of Allah (ﷺ) said to us: 'Bear witness' meaning: The house has drawn near, and the moon has been cleft asunder (54:1)."
from Ibn 'Abbas (regarding this Ayah): Those who avoid great sins and Al-Fawahish except Al-Lamam (minor sins) (53:32). He said: "The Prophet (ﷺ) said: 'Your forgiveness, O Allah is so ample, and which of Your worshipers has not committed Al-Lamam (minor sins)!'"
"The people of Makkah asked the Prophet (ﷺ) for a sign, so the moon was cleft asunder in Makkah two times (meaning two parts), so the following was revealed: 'The Hour has drawn near, and the moon has been cleft asunder, up to his saying: 'Magic, Mustamir (54:1 & 2)' meaning 'Going away.'"