﴿ لِّيَشْهَدُوا۟ مَنَٰفِعَ لَهُمْ وَيَذْكُرُوا۟ ٱسْمَ ٱللَّهِ فِىٓ أَيَّامٍۢ مَّعْلُومَٰتٍ عَلَىٰ مَا رَزَقَهُم مِّنۢ بَهِيمَةِ ٱلْأَنْعَٰمِ ۖ فَكُلُوا۟ مِنْهَا وَأَطْعِمُوا۟ ٱلْبَآئِسَ ٱلْفَقِيرَ ﴾

“so that they might experience much that shall be of benefit to them, and that they might extol the name of God on the days appointed [for sacrifice], over whatever heads of cattle He may have provided for them [to this end]: eat, then, thereof, and feed the unfortunate poor.”

Please check ayah 22:29 for complete tafsir.