سنن أبي داود

Narrated Qabisah al-Hilali:

There was an eclipse of the sun in the time of the Messenger of Allah (ﷺ). He came out bewildered pulling his garment, and I was in his company at Medina. He prayed two rak'ahs and stood for a long time in them. He then departed and the sun became bright. He then said: There are the signs by means of which Allah, the Exalted, produces dread (in His servants). When you see anything of this nature, then pray as you are praying a fresh obligatory prayer.