NASAI-KUBRA 5744:
from Ṣafwān b. Yaʿlá b. Umayyah from his father —
The Messenger of Allah ﷺ said to me: When my messengers come to you, give them thirty coats of mail, and thirty camels. I asked: Messenger of Allah, is it a loan with a guarantee of its return, or a loan to be paid back? He replied : It is a loan to be paid back. (Using translation from Abū Dāʾūd 3566)
الكبرى للنسائي ٥٧٤٤:
عن صفوان بن يعلى بن اميه عن أبيه —
قَالَ لِي رَسُولُ اللهِ ﷺ «إِذَا أَتَتْكَ رُسُلِي فَأَعْطِهِمْ ثَلَاثِينَ دِرْعًا وَثَلَاثِينَ بَعِيرًا» فَقُلْتُ يَا رَسُولَ اللهِ أَعَارِيَةٌ مَضْمُونَةٌ أَوْ عَارِيَةٌ مُؤَدَّاةٌ؟ قَالَ «بَلْ عَارِيَةٌ مُؤَدَّاةٌ»