Whenever the Messenger of Allah ﷺ was traveling at a brisk pace, he would combine the Maghrib and Isha prayers.
حدثنا وكيع عن العمري عن نافع
كان رسول الله ﷺ إذا جد به السير جمع بين المغرب والعشاء
Its isnad is sahih, and it is a repetition of 5791.