مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3899
Musnad of Abdullah bin Mas'ood
It was narrated that ‘Abdullah (رضي الله عنه) said: The moon split at the time of the Messenger of Allah (ﷺ) such that I saw the mountain between the two halves of thernoon.
Musnad Ahmad 3924A saheeh hadeeth]