Al-Matalib al-'Aliyah 3736 — Surah al-Qamar

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) regarding this statement of Allah Almighty: "The Hour has drawn near and the moon has split" [Surah al-Qamar: 1], that he said: "The miracle of the splitting of the moon has already taken place in Makkah."
The chain of this report contains Ali bin Asim al-Wasiti, whose memory the hadith scholars have criticised; however, the occurrence of the splitting of the moon in Makkah is established by other authentic and mutawatir hadith. Imam Ahmad bin Mani' related it in his Musnad.