'Uthman (May Allah be pleased with him) reported:
I heard the Messenger of Allah (ﷺ) saying: "Spending a day on the frontier in Allah's way is better than one thousand days in any other place."[At-Tirmidhi]. (PT)
App reference (PT): Book 12, Hadith 9 (PT)
Arabic/English book reference (PT): Book 12, Hadith 1293 (PT)