'Slacken' in the Bible

Then she saddled an ass, and said to her servant, Drive, and go forward; slacken me not the riding, except I bid thee.

And God sent an angel to Jerusalem to destroy it, and as [he was about] to destroy [it], Yahweh saw and was grieved on account of the calamity. Then he said to the angel, the destroyer, "[It is] enough; slacken your hand." And the angel of Yahweh was standing by the threshing floor of Ornan the Jebusite.