Isaiah 58:12 RSTNE - And they that shall be from among you shall build the old ruined places, you shall restore the foundations of many generations; and you shall be called, Gadar-Peretz, the restorer of paths to live in.
Restorer of the Breach. The dictionary defines 'breach' like this:
1 : infraction or violation of a law, obligation, tie, or standard
2 a : a broken, ruptured, or torn condition or area
b : a gap (as in a wall) made by battering
So from the definition we can see the breach Isaiah is talking about here. It's a gap between us and the "paths to live in," and it was made that way by violating Yahweh's instructions. It is a break in the foundation of our faith.
The Hebrew for restorer or repairer drives this point even further. The word is shuv, which is the root word of repentance, and it literally means to "turn back to Yahweh." Restoration can only happen when we repent of our own ways and get back on Yahweh's path.
The imagery of paths is very prevalent in Scripture; it is not limited to simply your life, but rather the way Yahweh desires all of us to live. Walking on Yahweh's path means doing things his way, both trusting in Yeshua and keeping the Torah instructions. Early believers in Yeshua described themselves as followers of The Way. Same idea here.
Yahweh is speaking of things in his Word that have long been ruined or forgotten about.
Things like honoring Shabbat, the Festivals of Yahweh, and eating according to Scripture have been mostly disregarded throughout the centuries but Yahweh is equipping us to be Restorers of this Breach. The one path of Yahweh, of trusting in Yeshua and honoring the Torah, will be restored. The national heritage of Israel will be restored and Yahweh will bring both houses to the truth.
This passage tells us that no matter how long his Word has been misunderstood or disregarded, Yahweh promises to restore it. Yahweh desires the old, foundational places of our faith be restored so that we can walk in his way, on his path. He says some of Israel will be known as 'Restorers' of his way. When the path to live in is restored, more people will walk on it.
Ezekiel 36:36 - "I Yahweh rebuild the ruined places."