Lev 23 God loved his people so much that he established memorial days that they might focus on who He is and His provision for their every need. The seven feasts all pointed to Christ, who was yet to come. When He came, he established communion or what we call the Lord’s Supper, to point to God’s eternal plan to be completed. As NT believers, we are not responsible for keeping the OT memorials but studying them as a way of enhancing our faith. Only in the NT are we commanded to keep the Lord’s Supper as a way of remembering Jesus Christ as our perfect sacrifice.
The Hebrew word for “feasts” is (moadim) and means “appointed times.” They reveal God’s story of the plan of redemption of the Son of God’s death and resurrection and the promise of his future coming. The one requirement for all is seeing them as a sacred observance. We are to honor the Lord as his called sanctified saints and it should be done in holiness and reverence.