'Successor' in the Bible

After two years had passed, Felix received a successor, Porcius Festus, and because he wished to do a favor for the Jews, Felix left Paul in prison.

Without [any record of] father or mother, nor ancestral line, without [any record of] beginning of days (birth) nor ending of life (death), but having been made like the Son of God, he remains a priest without interruption and without successor.

but He, because He continues for ever, has a priesthood which does not pass to any successor.