the Messenger of Allah joined Maghrib and Isha; in Jam (Al-Muzdalifah), with one Iqamah, and he did not offer any voluntary prayers in between or after either of them. (Using translation from Nasāʾī 3028)
أَنَّ رَسُولَ اللهِ ﷺ جَمَعَ بَيْنَ الْمَغْرِبِ وَالْعِشَاءِ بِجَمْعٍ بِإِقَامَةٍ وَلَمْ يُسَبِّحْ بَيْنَهُمَا وَلَا عَلَى أَثَرِ وَاحِدَةٍ مِنْهُمَا