'Mercy' in the Bible

The LORD is longsuffering, and of great mercy, forgiving iniquity and transgression, and by no means clearing the guilty, visiting the iniquity of the fathers upon the children unto the third and fourth generation.

Pardon, I beseech thee, the iniquity of this people according unto the greatness of thy mercy, and as thou hast forgiven this people, from Egypt even until now.

And the Lord said, I have had mercy, as you say:

Because he had no respect for the word of the Lord, and did not keep his law, that man will be cut off without mercy and his sin will be on him.