"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."
أَنَّهُ اسْتُغِيثَ عَلَى بَعْضِ أَهْلِهِ فَجَدَّ بِهِ السَّيْرُ فَأَخَّرَ الْمَغْرِبَ حَتَّى غَابَ الشَّفَقُ ثُمَّ نَزَلَ فَجَمَعَ بَيْنَهُمَا ثُمَّ أَخْبَرَهُمْ أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يَفْعَلُ ذَلِكَ إِذَا جَدَّ بِهِ السَّيْرُ