My son, if you have taken a pledge on behalf of your friend, then you have bound your hand to an outsider
Other versions
King James Version
My son, if thou be surety for thy friend, if thou hast stricken thy hand with a stranger,English Standard Version
My son, if you have put up security for your neighbor, have given your pledge for a stranger,New International Version
My son, if you have put up security for your neighbor, if you have struck hands in pledge for another,