2 Thessalonians 1:8

with his mighty angels, in flaming fire, taking vengeance on those who know not God, and who obey not the gospel of our Lord Jesus Christ:

2 Timothy 2:24

but to be gentle towards all men, ready to teach, patient under injuries,

Hebrews 3:5-6

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

1 Peter 2:8

and a stone of stumbling, and a rock of offence. These stumble at the word through unbelief, unto which also they were appointed.

1 Peter 4:17

For the time is coming when judgement is to begin at the house of God: and if at us first, what will be the end of those 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
with his mighty angels, in flaming fire, taking vengeance on those 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. These stumble at the word through unbelief, unto which also they were appointed.
1 Peter 4:17
For the time is coming when judgement is to begin at the house of God: and if at us first, what will be the end of those that obey not the gospel of God?

Moses

2 Timothy 2:24
but to be gentle towards all men, ready to teach, patient under injuries,
Hebrews 3:5
Now Moses was indeed faithful in all his house as a servant, for a testimony of the things which were to be spoken: