22 Jesus answered, “I tell you, not seven times, but seventy-seven times.[a]
[a] or... seventy times seven
Why did Jesus say seventy-seven times or seventy times seven? Do these numbers have any literal meaning? I don't think so. He could have said seventy-five times or some other random number, it won't change the actual message.
We must be ready to forgive as many times as our brother or sister sins against us. Easier said than done, but that's the principle.