(16) باب فَضْلِ صَلاَةِ الْعَصْرِ
Narrated Qais:
Jarir said, "We were with the Prophet (ﷺ) and he looked at the moon--full-moon--and said, 'Certainly you will see your Lord as you see this moon and you will have no trouble in seeing Him. So if you can avoid missing (through sleep or business, etc.) a prayer before the sunrise (Fajr) and a prayer before sunset (`Asr), you must do so.' He then recited Allah's Statement: And celebrate the praises Of your Lord before the rising of the sun and before (its) setting." (50.39) Isma`il said, "Offer those prayers and do not miss them."
Reference: Sahih al-Bukhari 554
In-book reference: Book 9, Hadith 31
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 10, Hadith 529