Charles Spurgeon Commentary Deuteronomy 32:35-36

"Vengeance is mine, and recompense, At the time when their foot shall slide: For the day of their calamity is at hand, And the things that are to come upon them shall make haste. For Jehovah will judge his people, And repent himself for his servants; When he seeth that [their] power is gone, And there is none [remaining], shut up or left at large." — Deuteronomy 32:35-36 (ASV)

To me belongs vengeance, and recompense; their foot shall slide in due time: for the day of their calamity is at hand, and the things that shall come upon them make haste. For the LORD shall judge his people,

He will not always let his enemies triumph over them. He will come back to his people whom he seemed to cast away. The Lord shall judge his people.