'Slack' in the Bible

And repayeth them that hate him to their face, to destroy them: he will not be slack to him that hateth him, he will repay him to his face.

When thou shalt vow a vow unto the LORD thy God, thou shalt not slack to pay it: for the LORD thy God will surely require it of thee; and it would be sin in thee.

And the men of Gibeon sent unto Joshua to the camp to Gilgal, saying, Slack not thy hand from thy servants; come up to us quickly, and save us, and help us: for all the kings of the Amorites that dwell in the mountains are gathered together against us.

And Joshua said unto the children of Israel, How long are ye slack to go to possess the land, which the LORD God of your fathers hath given you?

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

He becometh poor that dealeth with a slack hand: but the hand of the diligent maketh rich.

In that day it shall be said to Jerusalem, Fear thou not: and to Zion, Let not thine hands be slack.

The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.