Narrated Ya'la bin Umaiya (RA):

Allah's Messenger (ﷺ) said to me, "When my messengers come to you, give them thirty coats of armor." I asked, "O Allah's Messenger (ﷺ) , is it a loan with a guarantee (of its return), or a borrowed object that must be returned?" He replied, "No, it is a borrowed object that must be returned." [Reported by Ahmad, Abu Dawud and an-Nasa'i. Ibn Hibban graded it Sahih (authentic)].

وَعَنْ يَعْلَى بْنِ أُمَيَّةَ ‏- رضى الله عنه ‏- قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ إِذَا أَتَتْكَ رُسُلِي فَأَعْطِهِمْ ثَلَاثِينَ دِرْعاً ", قُلْتُ: يَا رَسُولَ اَللَّهِ ! أَعَارِيَةٌ مَضْمُونَةٌ أَوْ عَارِيَةٌ مُؤَدَّاةٌ? قَالَ: بَلْ عَارِيَةٌ مُؤَدَّاةٌ } رَوَاهُ أَحْمَدُ, وَأَبُو دَاوُدَ, وَالنَّسَائِيُّ, وَصَحَّحَهُ اِبْنُ حِبَّانَ [1]‏ .‏