Matthew 6:7

And praying do not use vain repetitions as the heathen do: for they think they shall be heard in their much speaking.

Romans 1:21

because, knowing God, they did not glorify Him as God, neither were they thankful; but they became vain in their reasonings, and their foolish heart was darkened.

1 Peter 1:18

knowing that you have been redeemed from your depraved character transmitted from your ancestors, not by corruptible things, silver or gold,

Treasury of Scripture Knowledge

Summary

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.

General references

Bible References

Customs

Matthew 6:7
And praying do not use vain repetitions as the heathen do: for they think they shall be heard in their much speaking.
Romans 1:21
because, knowing God, they did not glorify Him as God, neither were they thankful; but they became vain in their reasonings, and their foolish heart was darkened.
1 Peter 1:18
knowing that you have been redeemed from your depraved character transmitted from your ancestors, not by corruptible things, silver or gold,

General references

Acts 16:21
and they proclaimed customs, which are not lawful for us to receive, or to do, being Romans.