Nahj al-Balāgha
Hadith 1463أَمَّا 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.