Then Jesus said

Some languages may add, "to his disciples."

This

"This" refers back to the way the king punished the unforgiving servant in 29:08.

That is, "my Father in heaven." Jesus is expressing his unique, personal relationship to God the Father.

See how you translated this in 29:01.

That is, "with sincerity" or, "truly" or, "genuinely" or, "honestly."

These references may be slightly different in some Bible translations.