Matthew 6:7

But when you pray, do not use vain repetitions, as the heathen do: for they think that they will be heard for their many words.

Romans 1:21

because, when they knew God, they did not glorify him as God, nor were they thankful; but they became perverse in their reasonings, and their wicked heart was darkened;

1 Peter 1:18

because you know that you were not redeemed with corruptible things, as silver or gold, from your vain mode of life received by tradition from 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
But when you pray, do not use vain repetitions, as the heathen do: for they think that they will be heard for their many words.
Romans 1:21
because, when they knew God, they did not glorify him as God, nor were they thankful; but they became perverse in their reasonings, and their wicked heart was darkened;
1 Peter 1:18
because you know that you were not redeemed with corruptible things, as silver or gold, from your vain mode of life received by tradition from your fathers,

General references

Acts 16:21
and they teach customs which it is not lawful for us, who are Romans, to receive or to observe.