To depute a person, present or absent
باب وَكَالَةُ الشَّاهِدِ وَالْغَائِبِ جَائِزَةٌ
Sahih al-Bukhari, Book of Representation, Authorization, Business by Proxy(view book)
Sahih al-Bukhari 2305
Narrated Abu Huraira:
The Prophet owed somebody a camel of a certain age. When he came to demand it back, the Prophet ﷺ said (to some people), "Give him (his due)." When the people searched for a camel of that age, they found none, but found a camel one year older. The Prophet ﷺ said, "Give (it to) him." On that, the man remarked, "You have given me my right in full. May Allah give you in full." The Prophet ﷺ said, "The best amongst you is the one who pays the rights of others generously."
حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا سُفْيَانُ، عَنْ سَلَمَةَ، عَنْ أَبِي سَلَمَةَ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ قَالَ كَانَ لِرَجُلٍ عَلَى النَّبِيِّ ﷺ سِنٌّ مِنَ الإِبِلِ فَجَاءَهُ يَتَقَاضَاهُ فَقَالَ " أَعْطُوهُ ". فَطَلَبُوا سِنَّهُ فَلَمْ يَجِدُوا لَهُ إِلاَّ سِنًّا فَوْقَهَا. فَقَالَ " أَعْطُوهُ ". فَقَالَ أَوْفَيْتَنِي أَوْفَى اللَّهُ بِكَ. قَالَ النَّبِيُّ ﷺ " إِنَّ خِيَارَكُمْ أَحْسَنُكُمْ قَضَاءً ".