Hebrews 2:1-3

Therefore we must pay more careful attention to what we have heard, lest we drift away from it.

Hebrews 10:28-29

Anyone who has rejected the law of Moses dies without mercy on the testimony of two or three witnesses.

Hebrews 12:25

See to it that you do not refuse him who is speaking. For if they did not escape when they refused him who warned them on earth, how much less shall we escape, if we turn away from him who warns us from heaven?

Treasury of Scripture Knowledge

Summary

Now they that died in the plague were fourteen thousand and seven hundred, beside them that died about the matter of Korah.

Bible References

Fourteen thousand

Hebrews 2:1
Therefore we must pay more careful attention to what we have heard, lest we drift away from it.
Hebrews 10:28
Anyone who has rejected the law of Moses dies without mercy on the testimony of two or three witnesses.
Hebrews 12:25
See to it that you do not refuse him who is speaking. For if they did not escape when they refused him who warned them on earth, how much less shall we escape, if we turn away from him who warns us from heaven?