Matthew Poole and continuators on Jeremiah 12:16

16 And it shall come to pass, If they will diligently learn the wayes of my people to swear by my name, the LORD liveth , (as they taught my people to swear by Baal) then shall they be built in the midst of my people .

Tho these people be heathens, yet if they will leave their Idolatries, and Superstitious wayes of Worship, and learn to worship and serve me as my people do and ought to worship me.

And swear by my name the Lord liveth, that is, pay that Homage which they pay to the Divine Being, to me, the living and true God; owning me alone as the fountain of life, and searcher of the hearts (for there is a great Homage paid to the true God in swearing by his name onely, which sheweth the great impiety and profaneness of other Oathes·)

Then, saith God, I will bless and prosper them also, and they shall not only have a portion in the Earth but amongst my people, which was eminently fulfilled in the Conversion of the Gentiles, Rom. 11.17. they were originally wild Olives and grafted in amongst the Iews, and with them made partakers of the root, and fatness of the Olive tree.