'Joining' in the Bible

are joining with their kinsmen, their nobles, and are taking on themselves a curse and an oath to walk in God’s law, which was given through Moses, God’s servant, and to keep and to observe all the commandments of God our Lord, and His ordinances and His statutes;

you also joining in helping us through your prayers, so that thanks may be given by many persons on our behalf for the favor bestowed on us through the prayers of many.