"Messenger of Allah (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."  

كَانَ النَّبِيُّ ﷺ يُصَلِّي قَبْلَ الْعَصْرِ أَرْبَعَ رَكَعَاتٍ يَفْصِلُ بَيْنَهُنَّ بِالتَّسْلِيمِ عَلَى الْمَلاَئِكَةِ الْمُقَرَّبِينَ وَمَنْ تَبِعَهُمْ مِنَ الْمُسْلِمِينَ وَالْمُؤْمِنِينَ  

The Prophet (S) said: "May Allah have mercy upon a man who prays four before Al-Asr."  

عَنِ النَّبِيِّ ﷺ قَالَ رَحِمَ اللَّهُ امْرَأً صَلَّى قَبْلَ الْعَصْرِ أَرْبَعًا