'Supple' in the Bible

But his bow abideth firm, And the arms of his hands are supple By the hands of the Mighty One of Jacob. From thence is the shepherd, the stone of Israel:

And as for thy nativity, in the day thou wast born thy navel was not cut, neither wast thou washed in water to supple thee; thou wast not salted at all, nor swaddled at all.