674. hadíth
وَ قَالَ رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ: «مِنَ اَلسُّنَّةِ إِذَا خَرَجَ اَلْقَوْمُ فِي سَفَرٍ أَنْ يُخْرِجُوا نَفَقَتَهُمْ فَإِنَّ ذَلِكَ أَطْيَبُ لِأَنْفُسِهِمْ وَ أَحْسَنُ لِأَخْلاَقِهِمْ ».
The Messenger of Allah (swt) (peace and blessings of Allah (swt) be upon him and his family) said: "It is from the Sunnah that when people set out on a journey, they pool their expenses. This is more soothing for their hearts and better for their conduct."