"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 ﷺ said: May Allah show mercy to a man who prays four rak'ahs before the afternoon prayer.  

قَالَ رَسُولُ اللَّهِ ﷺ رَحِمَ اللَّهُ امْرَأً صَلَّى قَبْلَ الْعَصْرِ أَرْبَعًا  

That the Prophet ﷺ used to pray two rak'ahs before the 'Asr prayer.  

أَنَّ النَّبِيَّ ﷺ كَانَ يُصَلِّي قَبْلَ الْعَصْرِ رَكْعَتَيْنِ