John Trapp on Isaiah 19:19

Ver. 19. In that day ſhall there be an altar to the Lord] A ſpiritual altar for ſpiritual ſacrifices, as ver. 20. Heb. 13.10. Onias the Jewiſh Prieſt who hereupon went and built an altar at Heliopolis in Egypt, and ſacrificed to God there, was as much miſtaken as the Anabaptiſts of Germany were in their Munſter which they termed new Jeruſalem and acted accordingly, ſending forth Apoſtles, caſting out orthodox Miniſters, &c.

And a pillar in the border thereof] that is, ſaith One, the Goſpels and writings of the Apoſtles, that pillar and ground of truth: Or a publike confeſſion of the Chriſtian faith, Rom. 10 9. An alluſion to Joſh. 22.10, 25. See Zech. 14.9 20, 21.