These same words are found in the King James version, the Phillips Modern English version, The Living Bible, the New English Bible, and many other translations.

However, in The Jerusalem Bible, the Augsburg Study Bible New Revised Standard Version, and several other more modern translations, Matthew 18:22 reads,
Jesus answered, "Not seven, I tell you, but seventy-seven times."

Somebody changed the math. In the older translations, Jesus' answer was 70 x 7 or 490 times, but the newer translations changed his answer to 77 times. Of course, Jesus did not mean that we should stop forgiving after 490 times or even 77 times -- he meant that there should be no limits to our forgiveness. In The Interpreter's Bible, it mentions both of these numbers., but it calls this "celestial arithmetic" -- we must do the math in our hearts. It is a problem in conduct rather than in arithmetic.
The rabbis said that three pardons were enough. Peter proposed magnanimity, and so suggested seven. But Jesus insisted that there must be no limits to forgiveness.

Luke 17:4 also mentions this conversation with the seven times.
Luke 17:5 tells us that when the disciples heard this requirement of Jesus for unlimited forgiveness, they exclaimed, "Increase our faith!"