Behold, the princes of Israel, every one were in thee to their power to shed blood. Behold, the princes of Israel, every one were in thee to their power to shed blood - rather, 'The princes ... each according to his power, were in thee to shed blood' (as if this only object of their existence).
Power - literally, arm: they, who ought to have been patterns of justice, made their own arm of might their only law.