G2480–ἰσχύω–ischuō

For a will is in force where there has been death, for it is never in force while he who made it lives.

ἰσχύει ischuei “it is in force”

Confess your offenses to one another, and pray one for another, that you may be healed. The effective, earnest prayer of a righteous man is powerfully effective.

ἰσχύει ischuei “prevails”

They didn't prevail, neither was a place found for him any more in heaven.

ἴσχυσεν, ischusen “he had [enough] strength,”