Sahih Muslim 1600
Sahih Muslim · Book 22: The Book of Musaqah · It is permissible to lend animals and it is recommended to pay in full, giving something better than that which ts owed
Abu Rafi', the freed slave of Allah's Messenger (ﷺ), said:
حَدَّثَنَا أَبُو كُرَيْبٍ ، حَدَّثَنَا خَالِدُ بْنُ مَخْلَدٍ ، عَنْ مُحَمَّدِ بْنِ جَعْفَرٍ ، سَمِعْتُ زَيْدَ بْنَ أَسْلَمَ ، أَخْبَرَنَا عَطَاءُ بْنُ يَسَارٍ ، عَنْ أَبِي رَافِعٍ ، مَوْلَى رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ اسْتَسْلَفَ رَسُولُ اللَّهِ صلى الله عليه وسلم بَكْرًا . بِمِثْلِهِ غَيْرَ أَنَّهُ قَالَ " فَإِنَّ خَيْرَ عِبَادِ اللَّهِ أَحْسَنُهُمْ قَضَاءً " .
Allah's Messenger (ﷺ) took as a loan (the rest of the hadith is the same), but with this variation that he (the Holy Prophet) said: Good amongst the servants of Allah is he who is best in paying off the debt.