Jami` at-Tirmidhi 555
جامع الترمذي#555SahihNafi narrated:"Ibn Umar had been requested to urgently attend to one of his wives, so he hurried en route and delayed Maghrib until the twilight disappeared, then he dismounted to combine them (the prayers). Then he informed them that the Messenger of Allah would do that when he was in a hurry on a trip
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih Muslim
In-book reference: 6:12