Sahih Bukhari
Beginning of Creation
Volume: 004 / Book Number: 054 / Hadith Number: 424
Narrated 'Abdullah bin 'Abbas:
The Prophet said, "The sun and the moon are two signs amongst the Signs of Allah. They do not eclipse because of someone's death or life. So, if you see them (i.e. eclipse), celebrate the Praises of Allah (i.e. pray)."