To various governors concerning prayers
Nahj al-Balāgha|Volume 1|Book 2|Chapter 52
أَمَّا بَعْدُ، فَصَلُّوا بَالنَّاسِ الظُّهْرَ حَتَّى تَفِيءَ الشَّمْسُ مِنْ مَرْبِضِ الْعَنْزِ.
Now, say the ẓuhr (noon) prayers with the people when the shade of the wall of the goats’ pen is equal to the wall.