Proverbs 14:25
A truthful witness saves lives. A deceitful witness speaks lies.
Proverbs 14:5
A faithful witness will not lie, but a false witness utters lies.
Acts 20:21
I witnessed to both Jews and to Greeks about repentance toward God, and faith toward our Lord Jesus Christ.
Acts 20:26-27
I declare to you today that I am innocent of the blood of all men.
Acts 26:16-20
Stand up on your feet. I have appeared to you for this purpose, to make you a minister and a witness both of these things that you have seen, and of those things I will show to you.
1 Timothy 4:1-3
The Spirit explicitly says that some will fall away from the faith (truth) in later times. Spirits and doctrines of demons will seduce them,
2 Peter 3:3
Know this first, that in the last days, mockers will come with mockery, walking after their own lusts,