وَاشْتَرَوْا لَهُ بَعِيرًا فَأَعْطُوهُ إِيَّاهُ، قَالُوا: لَا نَجِدُ إِلَّا أَفْضَلَ مِنْ سِنِّهِ، قَالَ: «اشْتَرُوهُ فَأَعْطُوهُ إِيَّاهُ؛ فَإِنَّ خَيْرَكُمْ أَحْسَنُكُمْ قَضَاءً». (Bukhari and Muslim, as printed)
Translation: The Prophet ﷺ ordered that a camel be purchased and given to the creditor. The Companions said that they could only find one older or better than what was due. He told them to give it, explaining that the best of people are those who repay in the best manner.
This continues the same account. The creditor's claim was heard, and payment was made generously. Good repayment here includes willingness to discharge an obligation properly.
The improved camel was given voluntarily at settlement; the event should not be confused with imposing a contractual increase on a loan.