Habakkuk 2:4

"See, he (the Babylonians or Babylonian king) is puffed up; his desires are not upright--but the righteous will live by his faith--..."

but the righteous
Ezekiel 18:9 "He follows my decrees and faithfully keeps my laws. The man is righteous; he will surely live, declares the Sovereign LORD."

will live by his faith
Romans 1:17 For in the gospel a righteousness from God is revealed, a righteousness that is by faith from first to last, just as it is written: "The righteous will live by faith."
Galatians 3:11 Clearly no one is justified before God by the law, because, "The righteous will live by faith."
Ephesians 2:8-9 For it is by grace you have been saved, through faith--and this not from yourselves, it is the gift of God--not by works, so that no one can boast.
Hebrews 10:37-39 For in just a very little while, "He who is coming will come and will not delay. But my righteous one will live by faith. And if he shrinks back, I will not be pleased with him." But we are not of those who shrink back and are destroyed, but of those who believe and are saved.

NOTES:
Read Romans 8
Isaiah 26:1-6

(parentheses are mine)

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984 by International Bible Society. Used by permission. All rights reserved worldwide.