عَبْدِ بْنِ حُمَيْدٍ الْكَشِّيِّ
1  
`Abd ibn Humayd al-Kashshi
Salamah ibn al-Akwaʿ (may Allah be pleased with him) reported that the Prophet ﷺ used to pray Maghrib the moment the sun set, once its upper rim had disappeared. Reference: Thulāthiyyāt ʿAbd ibn Ḥumayd al-Kashshī 2
وَبِهَذَا الْإِسْنَادِ قَالَ: أَخْبَرَنَا صَفْوَانُ بْنُ عِيسَى، عَنْ يَزِيدَ بْنِ أَبِي عُبَيْدٍ، عَنْ سَلَمَةَ بْنِ الْأَكْوَعِ، أَنَّ النَّبِيَّ ﷺ كَانَ يُصَلِّي الْمَغْرِبَ سَاعَةَ تَغْرُبُ الشَّمْسُ إِذَا غَابَ حَاجِبُهَا.
Grade: Ṣaḥīḥ, meeting the conditions of Muslim
Arabic/English book reference : Book 1, Hadith 2