We came upon the Messenger of Allah ﷺ in Medina. He would postpone the afternoon prayer as long as the sun remained white and clear.
قَدِمْنَا عَلَى رَسُولِ اللَّهِ ﷺ الْمَدِينَةَ فَكَانَ يُؤَخِّرُ الْعَصْرَ مَا دَامَتِ الشَّمْسُ بَيْضَاءَ نَقِيَّةً