Sahih Muslim
The Book of Prayers (Kitab Al-Salat)
Book Number: 004 / Hadith Number: 1994
'Abdullah b. 'Umar reported that the Messenger of Allah (may peace be upon him) observed: Verily the sun and the moon do not eclipse on account of the death or life of anyone. They are in fact the signs among the signs of Allah. So when you see them, observe prayer.