To various governors concerning prayers
Nahj al-Balāgha|Volume 1|Book 2|Chapter 52
وَصَلُّوا بِهِمُ الْعَصْرَ وَالشَّمْسُ بَيْضَاءُ حَيَّةٌ فِي عُضْوٍ مِنَ النَّهَارِ حِينَ يُسَارُ فِيهَا فَرْسَخَانِ.
Say the ‘aṣr (afternoon) prayers with them when the sun is still shining in a portion of the day enough for covering the distance of two farsakhs (about six miles).