بسم الله الرحمن الرحيم
إنّا أَعْطَيْناكَ الكوثر(1) فصلِّ لربِّكَ وانْحَرْ (2) إنَّ شانِئكَ هو الأَبْتَر (3) سورة الكوثر
Therein mentions Allah’s gift to His Prophet and chosen one, in that He gave him Al Kawthar i.e., abundant good and tremendous grace. In particular the river that Allah -glorified and exalted is He- will bestow upon him on the Day of Resurrection, and also the pond. (1)
“Therefore pray to your Lord” being thankful to Allah for His bounty, grace, and tremendous gift.
“And sacrifice” your slaughtered animal to your Lord, being sincere in your religion to Allah, just as Allah says:
قل إن صلاتي و نسكي و محياى و مماتي لله رب العالمين * لا شريك له
“Say (Muhammad): ‘Surely my prayer, sacrifice, life, and death are for Allah alone, the Lord of existence. He has no partner…’ “ [Al-An’am: 162-163]
“Indeed he who hates you” i.e., your enemy, he who loathes you “Is cut off” i.e., from every good, and from a noble mention, as he will not be remembered except as being evil and wicked.
Translated by Najeeb ibn Yusuf Al Anjelesi
Source: شرح الدروس المهمة لعامة الأمة
1: The Pond referred to, will be on this earth during the Day Of Recompense. The river is in Paradise.