'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]. (ES)
App reference (ES): Book 12, Hadith 9 (ES)
Arabic/English book reference (ES): Book 12, Hadith 1293 (ES)