Narrated: 'Umair, the freed slave of commanded me to cut up some meat, then a poor man came so I gave him some. When my master fund out about that, he beat me, so I went to the Messenger of Allah (ﷺ) and he came to him and said: 'Do not beat him.' He said: 'He gave away my food without me telling him to.' He said: 'The reward will be shared between you both."'
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا حَاتِمٌ، عَنْ يَزِيدَ بْنِ أَبِي عُبَيْدٍ، قَالَ سَمِعْتُ عُمَيْرًا، مَوْلَى آبِي اللَّحْمِ قَالَ أَمَرَنِي مَوْلاَىَ أَنْ أُقَدِّدَ، لَحْمًا فَجَاءَ مِسْكِينٌ فَأَطْعَمْتُهُ مِنْهُ فَعَلِمَ بِذَلِكَ مَوْلاَىَ فَضَرَبَنِي فَأَتَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم فَدَعَاهُ فَقَالَ " لِمَ ضَرَبْتَهُ " . فَقَالَ يُطْعِمُ طَعَامِي بِغَيْرِ أَنْ آمُرَهُ وَقَالَ مَرَّةً أُخْرَى بِغَيْرِ أَمْرِي قَالَ " الأَجْرُ بَيْنَكُمَا " .
sunnah.com