'Chaff' in the Bible

The wicked [those who live in disobedience to God’s law] are not so,But they are like the chaff [worthless and without substance] which the wind blows away.

Let them be [blown away] like chaff before the wind [worthless, without substance],With the angel of the Lord driving them on.

O my God, make them like whirling dust,Like chaff before the wind [worthless and without substance].