"He used to pray them before 'Asr, but if he got distracted or forgot them, he would pray them after 'Asr, and if he did a prayer he would be constant in it." (Using translation from Nasāʾī 578)
عَنِ الرَّكْعَتَيْنِ اللَّتَيْنِ كَانَ رَسُولُ اللهِ ﷺ يُصَلِّيهِمَا بَعْدَ الْعَصْرِ فَقَالَتْ إِنَّهُ كَانَ يُصَلِّيهِمَا قَبْلَ الْعَصْرِ فَشُغِلَ عَنْهُمَا أَوْ نَسِيَهُمَا فَصَلَّاهُمَا بَعْدَ الْعَصْرِ وَكَانَ إِذَا صَلَّى صَلَاةً أَثْبَتَهَا