Verses with the word reserveth in the Old Testament (2 verses):

Jeremiah 5:24
Neither say they in their heart, Let us now fear the LORD our God, that giveth rain, both the former and the latter, in his season: he reserveth unto us the appointed weeks of the harvest.

Nahum 1:2
God is jealous, and the LORD revengeth; the LORD revengeth, and is furious; the LORD will take vengeance on his adversaries, and he reserveth wrath for his enemies.