Proverbs 14:5 makes the same point: a faithful witness does not lie, while a false witness breathes lies — nearly identical teaching.

In Proverbs 12:17, the same contrast between truthful and false witness appears, reinforcing the value of honest testimony.

In Acts 20:26, Paul declares his faithful witness makes him innocent of their blood — directly reflecting 'a truthful witness saves lives'.

Paul's testimony in Acts 26:16-20 about turning people from darkness to light exemplifies a truthful witness that saves lives.