Ezekiel 18:31

"Rid yourselves of all the offenses you have committed, and get a new heart and a new spirit. Why will you die, O house of Israel?'

Rid yourselves of all the offenses you have committed
Judges 6:7-10 When the Israelites cried to the LORD because of Midian, he sent them a prophet, who said, "This is what the LORD, the God of Israel, says: I brought you up out of Egypt, out of the land of slavery. I snatched you from the power of Egypt and from the hand of all your oppressors. I drove them from before you and gave you their land. I said to you, 'I am the LORD your God; do not worship the gods of the Amorites, in whose land you live.' But you have not listened to me."

and get a new heart and a new spirit
Psalm 51:10 Create in me a pure heart, O God, and renew a steadfast spirit within me.
Ezekiel 11:19 "I will give them an undivided heart and put a new spirit in them; I will remove from them their heart of stone and give them a heart of flesh."
Ezekiel 36:26 "'I will give you a new heart and put a new spirit in you; I will remove from you your heart of stone and give you a heart of flesh.'"

Why will you die, O house of Israel?
Jeremiah 27:13 "Why will you and your people die by the sword, famine and plague with which the LORD has threatened any nation that will not serve the king of Babylon?"
Isaiah 1:16-18 "... wash and make yourselves clean. Take your evil deeds out of my sight! Stop doing wrong, learn to do right! Seek justice, encourage the oppressed. Defend the cause of the fatherless, plead the case of the widow. Come now, let us reason together," says the LORD. "Though your sins are like scarlet, they shall be as white as snow; though they are red as crimson they shall be like wool."

NOTES:
A new heart - promised unconditionally, attainable but not inevitable

Philippians 2:12-13 Therefore, my dear friends, as you have always obeyed--not only in my presence, but now much more in my absence--continue to work out your salvation with fear and trembling, for it is God who works in you to will and to act according to his good purpose.

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.