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.
Sunan an-Nasa'i Book 24, Hadith 411
← Previous Hadith the Prophet joined Maghrib and Isha in Jam (Al-Muzdalifah).

Sunan an-Nasa'i Book 24, Hadith 410 Next Hadith → "The Messenger of Allah joined Maghrib and Isha with no (Voluntary) prayer in between them. He prayed Maghrib with three Rakahs and Isha with two." And Abdullah bin Umar used to join them in like manner until he met Allahm, The Mighty and Sublime.

Sunan an-Nasa'i Book 24, Hadith 412