The Prophet (S) said: "May Allah have mercy upon a man who prays four before Al-Asr."
Jami` at-Tirmidhi Book 2, Hadith 283
← Previous Hadith "Allah's Messenger (S) would pray four Rak'ah before Al-Asr separating between them with At-Taslim upon the angels that are close (to Allah) and those who follow them among the Muslims and the believers."

Jami` at-Tirmidhi Book 2, Hadith 282 Next Hadith → "I can not enumerate (how many times) I heard Allah's Messenger (S) reciting - in the two Rak'ah after Al-Maghrib and the two Rak'ah before Salatul-Fajr with: Say: "O you disbelievers!" and Say: "He is Allah the One."

Jami` at-Tirmidhi Book 2, Hadith 284