God established a covenant with Noah to preserve him and his family before the flood. God established a covenant with Moses and Israel to preserve them and their families before the plagues and Passover. God the Son established a covenant with the disciples in the upper room before the ultimate judgment of the cross. The blood of Christ preserved them from the wrath of God poured out on the cross. And here in Acts 2 that covenant is continued and offered again freely to all Jerusalem and to us, and to our children. God extends his promises to you, just as your neighbor extends the tray of wine to you, expecting you to take the cup of salvation and pass it on to someone else.
But the promise. What is the promise? To preserve you from wrath as real as the flood. God has given you a way out. An ark is provided, a life raft. It is The Lord Jesus Christ. Not a boat we have to build ourselves. Not temporary, cramped quarters. Not an object but a person. In the indestructible life of Jesus, we find life everlasting. As we commune with Him, fear of the flood melts into peace of knowing Him.