God in these words declares that in that day he would renew his covenant with Israel, (at least the true Israelites,) and they should be his people to serve and to obey him, and he would be their God to protect and bless them with all temporal and all spiritual blessings.
Related Commentaries of Jeremiah 30:22
Jeremiah 30:22
22 And ye shall be my people, and I will be your God.