Matthew 6:7

When you pray, be not verbose, as the heathen are: for they think they shall be heard for their loquaciousness.

Romans 1:21

because when they knew God, they did not with gratitude glorify him as God, but their reasoning became extravagance, and their minds, void of judgment, were involv'd in darkness.

1 Peter 1:18

considering, that it was not by such perishable things as silver or gold, that you were releas'd from those vain rites and customs impos'd upon you by your fathers,

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
When you pray, be not verbose, as the heathen are: for they think they shall be heard for their loquaciousness.
Romans 1:21
because when they knew God, they did not with gratitude glorify him as God, but their reasoning became extravagance, and their minds, void of judgment, were involv'd in darkness.
1 Peter 1:18
considering, that it was not by such perishable things as silver or gold, that you were releas'd from those vain rites and customs impos'd upon you by your fathers,

General references

Acts 16:21
as it is not lawful for Romans, as we are, to admit or practise.