ذِكْرُ الْوَقْتِ الَّذِي يُسْتَحَبُّ فِيهِ أَدَاءُ الْمَرْءِ صَلَاةَ الْمَغْرِبِ
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). (Using translation from Muslim 636)
«كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي الْمَغْرِبَ إِذَا غَرَبَتِ الشَّمْسُ وَتَوَارَتْ بِالْحِجَابِ»