Bible Verses About Repentance: Danger of neglecting

Then began he to upbraid the cities wherein were done the most of his miracles, for that they had not done penance.

Woe thee, Corozain, woe to thee, Bethsaida: for if in Tyre and Sidon had been wrought the miracles that have been wrought in you, they had long ago done penance in sackcloth and ashes.

But I say unto you, it shall be more tolerable for Tyre and Sidon in the day of judgment, than for you.

And thou Capharnaum, shalt thou be exalted up to heaven? thou shalt go down even unto hell. For if in Sodom had been wrought the miracles that have been wrought in thee, perhaps it had remained unto this day.

But I say unto you, that it shall be more tolerable for the land of Sodom in the day of judgment than for thee.

No, I say to you: but unless you shall do penance, you shall all likewise perish.

No, I say to you: but except you do penance, you shall all likewise perish.

Behold, I will cast her into a bed: and they that commit adultery with her shall be in very great tribulation, except they do penance from their deeds,