It is narrated from Sayyiduna Ibn Mas'ud (may Allah be pleased with him) regarding the interpretation of the Qur'anic verse: «﴿اقْتَرَبَتِالسَّاعَةُوَانْشَقَّالْقَمَرُ﴾»[القمر : 1] that during the blessed era of the Prophet (peace and blessings be upon him), the moon was once split into two parts; one part went behind the mountain and the other part remained above the mountain. The Prophet (peace and blessings be upon him) said: "O Allah! Bear witness."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 4270