Jeremiah 10:3
"For the customs of the people are vain: for one cutteth a tree out of the forest, the work of the hands of the workman, with the axe."
Cross References (ranked by relevance)
Forasmuch as ye know that ye were not redeemed with corruptible things, as silver and gold, from your vain conversation received by tradition from your fathers;
Therefore shall ye keep mine ordinance, that ye commit not any one of these abominable customs, which were committed before you, and that ye defile not yourselves therein: I am the LORD your God.
But they are altogether brutish and foolish: the stock is a doctrine of vanities.
Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.
But when ye pray, use not vain repetitions, as the heathen do: for they think that they shall be heard for their much speaking.
Assemble yourselves and come; draw near together, ye that are escaped of the nations: they have no knowledge that set up the wood of their graven image, and pray unto a god that cannot save.
Thus saith the LORD, What iniquity have your fathers found in me, that they are gone far from me, and have walked after vanity, and are become vain?