2 Thessalonians 1:8

In flaming fire, taking vengeance on them who know not God, and who obey not the gospel of our Lord Jesus Christ.

2 Timothy 2:24

And a servant of the Lord must not strive, but be gentle toward all men,

Hebrews 3:5-6

And Moses verily was faithful in all his house as a servant, for a testimony of the things, which were to be afterwards spoken:

1 Peter 2:8

And a stone of stumbling, and a rock of offence, to them who stumble, not believing the word, whereunto also they were appointed.

1 Peter 4:17

For the time is come for judgment to begin at the house of God: but if it begin at us, what shall the end be of them that obey not the gospel of God?

Treasury of Scripture Knowledge

Summary

Because they obeyed not the voice of the LORD their God, but transgressed his covenant, and all that Moses the servant of the LORD commanded, and would not hear them, nor do them.

Bible References

They obeyed not

2 Thessalonians 1:8
In flaming fire, taking vengeance on them who know not God, and who obey not the gospel of our Lord Jesus Christ.
1 Peter 2:8
And a stone of stumbling, and a rock of offence, to them who stumble, not believing the word, whereunto also they were appointed.
1 Peter 4:17
For the time is come for judgment to begin at the house of God: but if it begin at us, what shall the end be of them that obey not the gospel of God?

Moses

2 Timothy 2:24
And a servant of the Lord must not strive, but be gentle toward all men,
Hebrews 3:5
And Moses verily was faithful in all his house as a servant, for a testimony of the things, which were to be afterwards spoken: