'Reserve' in the Bible

Also, a letter to Asaph, keeper of the king's land reserve, that he should give me timber for laying the beams for the gates of the citadel of the house and for the walls of the city, and for the house which I will enter." And the king gave [permission] to me, according to the good hand of God on me.

[then] the Lord knows how to rescue the godly from trials and to reserve the unrighteous to be punished at the day of judgment,