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Where does the Bible say to forgive seventy times seven?

It is in Matthew 18:22 · King James Version

«Jesus saith unto him, I say not unto thee, Until seven times: but, Until seventy times seven.»
Read the chapter Matthew 18 →

See also

Ephesians 4:32

And be ye kind one to another, tenderhearted, forgiving one another, even as God for Christ’s sake hath forgiven you.

Colossians 3:13

Forbearing one another, and forgiving one another, if any man have a quarrel against any: even as Christ forgave you, so also do ye.