Sahih Muslim Book 4, Hadith Number 1322.

Chapter : The severity (of punishment) in missing the ‘Asr prayer.

Jarir b. Abdullah is reported to have said: We were sitting with the Messenger of Allah (may peace be upon him) that he looked at the full moon and observed: You shall see your Lord as you are seeing this moon, and you will not be harmed by seeing Him. So if you can, do not let -yourselves be overpowered in case of prayer observed before the rising of the sun and its setting, i.e. the ‘Asr prayer and the morning prayer. Jarir then recited it: “Celebrate the praise of thy Lord before the rising of the sun and before Its setting” (xx. 130).