'A'isha reported that 'Umar misconstrued the fact that the Messenger of Allah ﷺ had prohibited the observance of prayer at the time of the rising sun and at the time of its setting.  

أَنَّهَا قَالَتْ وَهِمَ عُمَرُ إِنَّمَا نَهَى رَسُولُ اللَّهِ ﷺ أَنْ يُتَحَرَّى طُلُوعُ الشَّمْسِ وَغُرُوبُهَا  

Do not get used to observe prayer at the time of the rising sun and at the time of its setting and (exhorted the Muslims) to pray at their times.  

أَنَّهَا قَالَتْ لَمْ يَدَعْ رَسُولُ اللَّهِ ﷺ الرَّكْعَتَيْنِ بَعْدَ الْعَصْرِ قَالَ فَقَالَتْ عَائِشَةُ قَالَ رَسُولُ اللَّهِ ﷺ لاَ تَتَحَرَّوْا طُلُوعَ الشَّمْسِ وَلاَ غُرُوبَهَا فَتُصَلُّوا عِنْدَ ذَلِكَ