2 Kings 17:15

And they followed vanity, and became Vain. — The same expression occurs in Jeremiah 2:5. The word “vanity” (hèbel) has the article. It denotes strictly breath; and then that which is as transient as a breath. (Comp. Job 7:16.) Here the idols and their worship are intended. The cognate verb, “became vain,” means “dealt (or, ‘talked;’ Job 27:12) foolishly.” The LXX. has ἐματαιώθησαν. (Comp. Romans 1:21.)