Salama b. al-Akwa' reported that the Messenger of Allah (ﷺ) used to pray the evening prayer when the sun had set and disappeared (behind the horizon).
Sahih Muslim Book 5, Hadith 273
← Previous Hadith This hadith has been narrated by the same chain of transmitters by Hammam, and said about Abu Bakr that he was Ibn Abu Musa.

Sahih Muslim Book 5, Hadith 272 Next Hadith → 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.

Sahih Muslim Book 5, Hadith 274