This mystery is that the Gentiles are joint heirs and fellow members of the same body and co-sharers of the promise in Messiah Yeshua through the Good News.
From Him the whole body is fitted and held together by every supporting ligament. The proper working of each individual part produces the body’s growth, for building itself up in love.
He is not holding fast to the Head. It is from Him that the whole body, nourished and held together by its joints and tendons, grows with a godly increase.