مسند أحمد

It was narrated that Abu Salih, the freed slave of `Uthman bin `Affan (رضي الله عنه) said: I heard `Uthman (رضي الله عنه) say on the minbar: O people, I concealed from you a hadeeth that I heard from the Messenger of Allah (ﷺ) for fear that you would scatter away from me, then I thought that I should tell it to you, and let each one choose for himself what he thinks is best. I heard the Messenger of Allah (ﷺ) say: `Guarding the border for one day for the sake of Allah is better than a thousand other days doing other deeds.” `Abdullah bin ‘Abdur-Rahman bin Abi Dhubab narrated... A similar hadeeth]