When God redeemed Israel from Egypt He established a covenant with them, inviting their elders to eat and drink with Him through His mediator Moses. When Jesus redeemed His Church from their sins He established a better covenant with them, inviting His apostles to eat and drink with Him, the better mediator. You are brought into that covenant through faith in Him. Covenants have promises and obligations attached to them. Promises to believe and obligations to perform. They are all summarized in God’s Word which He has magnified. Seek the Lord Jesus in the ways He has set up: His Word, His sacraments, His people. Commune with Christ now.