Abu Salih, the freed slave of Uthman, says: I heard Uthman (may Allah be pleased with him) saying from the pulpit: I had concealed a hadith from you which I heard from the Messenger of Allah (peace and blessings of Allah be upon him) out of fear that you would separate from me. Then it occurred to me that I should narrate it to you so that everyone may choose for himself what he understands. I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: "Guarding the frontier for one day in the way of Allah is better than guarding for a thousand days elsewhere." __REF_N__ Imam Tirmidhi says: This hadith is hasan sahih gharib.
Hadith Referenceسنن ترمذي / كتاب فضائل الجهاد عن رسول الله صلى الله عليه وسلم / 1667