G2480–ἰσχύω–ischuō

For a testament [ergänzt: is] of force when men are dead, since it is in no way of force while the testator is alive.)

ἰσχύει ischuei “it is in force”

Confess therefore your offences to one another, and pray for one another, that ye may be healed. [ergänzt: The] fervent supplication of the righteous [ergänzt: man] has much power.

ἰσχύει ischuei “prevails”

and he prevailed not, nor was their place found any more in the heaven.

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