"No one of you should deliberately try to pray when the sun is rising, or when it is setting."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يَتَحَرَّ أَحَدُكُمْ فَيُصَلِّيَ عِنْدَ طُلُوعِ الشَّمْسِ وَعِنْدَ غُرُوبِهَا  

It was narrated from Ibn 'Umar that the Messenger of Allah ﷺ forbade praying when the sun is rising or setting.  

أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى أَنْ يُصَلَّى مَعَ طُلُوعِ الشَّمْسِ أَوْ غُرُوبِهَا