Jeremiah 12:16

And it shall come to pass, if they will diligently learn the ways of my people,.... Not their evil ways of sin or superstition, they sometimes stray into; but the ways which God has prescribed to them, and has directed them to walk in, and in which they do walk; and which are to be learned of the Lord, by a diligent attendance with his people on his word and ordinances; see Isaiah 2:3:

to swear by my name, the Lord liveth; that is, to worship and serve the living God, a self-existent Being, who has life in himself, and of himself, and not another; and is the fountain, author, and giver of natural life to all creatures, and spiritual and eternal life to his true worshippers: swearing is here put for the whole of religious worship, as in Deuteronomy 6:13:

(as they taught my people to swear by Baal;) to worship him, and other idols:

then shall they be built in the midst of my people; become part of the spiritual building the church; being laid upon the same foundation of the apostles and prophets, and built up a holy temple; a spiritual house for the Lord to dwell in; partaking of the same privileges and ordinances as the people of God; being fellow heirs, and of the same body, and partakers of the promise in Christ by the Gospel, Ephesians 2:20, it denotes the settlement and establishment of the Gentiles with the Jews in a Gospel church state. So the Targum,

"and they shall be established in the midst of my people.''