1 Corinthians 10:8

Nor must we act licentiously, as some of them did, and fell in a single day, twenty-three thousand of them.

Hebrews 2:2-3

For if the word uttered through angels stood firm, so that every transgression and act of disobedience met with its just retribution, how shall we escape if we neglect so great a salvation?

Treasury of Scripture Knowledge

Summary

And the children of Levi did according to the word of Moses: and there fell of the people that day about three thousand men.

Bible References

There fell

1 Corinthians 10:8
Nor must we act licentiously, as some of them did, and fell in a single day, twenty-three thousand of them.
Hebrews 2:2
For if the word uttered through angels stood firm, so that every transgression and act of disobedience met with its just retribution, how shall we escape if we neglect so great a salvation?