He who eateth my flesh. This is another confirmation; for while he alone has life in himself, he shows how we may enjoy it, that is, by eating his flesh; as if he had affirmed that there is no other way in which he can become ours, than by our faith being directed to his flesh. For no one will ever come to Christ as God, who despises him as man; and, therefore, if you wish to have any interest in Christ, you must take care, above all things, that you do not disdain his flesh. Dwelleth in me, and I in him. When he says that he dwelleth in us, the meaning is the same as if he had said, that the only bond of union, and the way by which he becomes one with us, is, when our faith relies on his death. We may likewise infer from it, that he is not now speaking of the outward symbol, which many unbelievers receive equally with believers, and yet continue separated from Christ. It enables us also to refute the dream of those who say, that Judas received the body of Christ as well as the other apostles, when Christ gave the bread to all; for as it is a display of ignorance to limit this doctrine to the outward sign, so we ought to remember what I have formerly said, that the doctrine which is here taught is sealed in the Lord's Supper. Now, it is certain, in the first place, that Judas never was a member of Christ; secondly, it is highly unreasonable to imagine the flesh of Christ to be dead and destitute of the Holy Spirit; and, lastly, it is a mockery to dream of any way of eating the flesh of Christ without faith, since faith alone is the mouth -- so to speak -- and the stomach of the soul.

Dwelleth in me - Is truly and intimately connected with me. To dwell or abide in him is to remain in the belief of his doctrine, and in the participation of the benefits of his death. Compare John 15:1-6; John 17:21-23.
I in him - Jesus dwells in believers by his Spirit and doctrine. When his Spirit is given them to sanctify them; when his temper, his meekness, his humility, and his love pervade their hearts; when his doctrine is received by them and influences their life, and when they are supported by the consolations of the gospel, it may be said that he abides or dwells in them.

Dwelleth in me, and I in him - Of all connections and unions, none is so intimate and complete as that which is effected by the digestion of aliments, because they are changed into the very substance of him who eats them; and this our Lord makes the model of that union which subsists between himself and genuine believers. He lives in them, and they in him; for they are made partakers of the Divine nature: 2-Peter 1:4. To this verse the following addition is made in the Codex Bezae, three copies of the Itala, and Victorinus. After these words - dwelleth in me, and I in him, they add, as the Father in me, and I in the Father. Verily, verily, I say unto you, that unless ye receive the body of the Son of man as the bread of life, ye have not life in him. This is a very remarkable addition, and is between thirteen and fourteen hundred years old.

He that eateth my flesh, and drinketh my blood,.... In the sense above given; See Gill on John 6:53;
dwelleth in me, and I in him. There is a mutual indwelling of Christ, and believers; Christ is the habitation, or dwelling place of his people: there is a secret dwelling in Christ; so the elect of God dwelt in the heart, and in the hands, and arms of Christ from everlasting; and as members in their head in election grace; and representatively in him, as the Mediator of the covenant; and they secretly and safely dwelt in him, when all mankind fell in Adam; and when he was on the cross, in the grave, and now he is in heaven; all which is owing to his own love, his Father's gift, and to secret union to him. But there is an open dwelling in him in time, which is here meant: God's elect, as in their natural state, are without Christ, and lie open to the law and justice of God; the Spirit of God convinces them of this state, and directs them to flee to Christ, as a city of refuge; when they find him a stronghold, a place of defence, and a proper dwelling for them, where they resolve to abide, and do abide; and where they dwell safely, peaceably, comfortably, and pleasantly; and from which dwelling place they will never be turned out. Likewise, the saints are the habitation or dwelling place of Christ; he dwells not in their heads and to tongues, but in their hearts, and by faith; which is here expressed, by eating his flesh, and drinking his blood; and which, though it is not the cause of Christ's dwelling here, yet is the means or instrument by which men receive him into their hearts, and retain him, and have communion with him; for he dwells in believers, not in such sense as he dwells in the world, by his omnipresence, and power; or in the human nature, by hypostatical union to it; but by his Spirit, and by faith, which is an instance of wonderful condescending grace, and is owing to union to him, and is expressive of communion with him, and is what will continue for ever.

He that eateth . . . dwelleth in me and I in him--As our food becomes incorporated with ourselves, so Christ and those who eat His flesh and drink His blood become spiritually one life, though personally distinct.