Isa 2:3, Lam 5:21, Joel 2:13, 1 Cor 5:7
In the Old Testament, King Hezekiah told the Israelites to keep the Passover and return to God. (2 Chron 30:1,6)
2 Chron 30:1 And Hezekiah sent to all Israel and Judah, and wrote letters also to Ephraim and Manasseh, that they should come to the house of the Lord at Jerusalem, to keep the passover unto the Lord God of Israel. 6 So the posts went with the letters from the king and his princes throughout all Israel and Judah, and according to the commandment of the king, saying, Ye children of Israel, turn again unto the Lord God of Abraham, Isaac, and Israel, and he will return to the remnant of you, that are escaped out of the hand of the kings of Assyria.
In the Old Testament, the prophet Isaiah prophesied that in the last days many people would come to God's house and God would communicate God's will to them. (Isa 2:3)
Isa 2:3 And many people shall go and say, Come ye, and let us go up to the mountain of the Lord, to the house of the God of Jacob; and he will teach us of his ways, and we will walk in his paths: for out of Zion shall go forth the law, and the word of the Lord from Jerusalem.
In the Old Testament, the Israelites asked God to turn them back to God and renew them as they were in the old days. (Lamentations 5:21)
Lamentations 5:21 Turn thou us unto thee, O Lord, and we shall be turned; renew our days as of old.
In the Old Testament, the prophet Joel appealed to the people of Israel to return to God. (Joel 2:13)
Joel 2:13 And rend your heart, and not your garments, and turn unto the Lord your God: for he is gracious and merciful, slow to anger, and of great kindness, and repenteth him of the evil.
Christ Jesus, the Passover Lamb, was sacrificed for us. So now we must come to Christ. (1 Corinthians 5:7)
1 Corinthians 5:7 Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us: