(38) باب بَيَانِ أَنَّ أَوَّلَ وَقْتِ الْمَغْرِبِ عِنْدَ غُرُوبِ الشَّمْسِ
Rafi' b. Khadij reported:
We used to observe the evening prayer with the Messenger of Allah (ﷺ) and then one of us would go away and he could see the (distant) place where his arrow would fall.
Reference: Sahih Muslim 637 a
In-book reference: Book 5, Hadith 277
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1329