ʿUmar got some property in Khaibar and he came to the Prophet ﷺ and informed him about it. The Prophet said to him, "If you wish you can give it in charity." So ʿUmar gave it in charity (i.e. as an endowment) the yield of which was to be used for the good of the poor, the needy, the kinsmen and the guests.  

أَنَّ عُمَرَ ؓ وَجَدَ مَالاً بِخَيْبَرَ فَأَتَى النَّبِيَّ ﷺ فَأَخْبَرَهُ قَالَ إِنْ شِئْتَ تَصَدَّقْتَ بِهَا فَتَصَدَّقَ بِهَا فِي الْفُقَرَاءِ وَالْمَسَاكِينِ وَذِي الْقُرْبَى وَالضَّيْفِ