Messenger of Allah ﷺ said, "None of you should try to pray at sunrise or sunset."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يَتَحَرَّى أَحَدُكُمْ فَيُصَلِّي عِنْدَ طُلُوعِ الشَّمْسِ وَلاَ عِنْدَ غُرُوبِهَا  

I heard Messenger of Allah ﷺ saying, "There is no prayer after the morning prayer till the sun rises, and there is no prayer after the ʿAsr prayer till the sun sets."  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ لاَ صَلاَةَ بَعْدَ الصُّبْحِ حَتَّى تَرْتَفِعَ الشَّمْسُ وَلاَ صَلاَةَ بَعْدَ الْعَصْرِ حَتَّى تَغِيبَ الشَّمْسُ  

You offer a prayer which I did not see being offered by Messenger of Allah ﷺ when we were in his company and he certainly had forbidden it (i.e. two rakʿat after the ʿAsr prayer).  

إِنَّكُمْ لَتُصَلُّونَ صَلاَةً لَقَدْ صَحِبْنَا رَسُولَ اللَّهِ ﷺ فَمَا رَأَيْنَاهُ يُصَلِّيهَا وَلَقَدْ نَهَى عَنْهُمَا يَعْنِي الرَّكْعَتَيْنِ بَعْدَ الْعَصْرِ  

Messenger of Allah ﷺ forbade the offering of two prayers: -1. after the morning prayer till the sunrises. -2. after the ʿAsr prayer till the sun sets.  

نَهَى رَسُولُ اللَّهِ ﷺ عَنْ صَلاَتَيْنِ بَعْدَ الْفَجْرِ حَتَّى تَطْلُعَ الشَّمْسُ وَبَعْدَ الْعَصْرِ حَتَّى تَغْرُبَ الشَّمْسُ