When you shall vow a vow to the LORD your God, you shall not be slack to pay it: for the LORD your God will surely require it of you; and it would be sin in you.
That which is gone out of your lips you shall observe and do; according as you have vowed to the LORD your God, a freewill offering, which you have promised with your mouth.
The children of Yisra'el didn't strike them, because the princes of the congregation had sworn to them by the LORD, the God of Yisra'el. All the congregation murmured against the princes.