Sahih al-Bukhari Book 9, Hadith 30
We were with Buraida in a battle on a cloudy day and he said, "Offer the `Asr prayer early as the
Prophet said, "Whoever leaves the `Asr prayer, all his (good) deeds will be annulled."
Allah's Messenger (ﷺ) said, "Whoever misses the `Asr prayer (intentionally) then it is as if he lost his family and property."
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."