Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day.

Jamieson-Fausset-Brown Bible Commentary

54. Whoso eateth . hath, &c.-The former verse said that unless they partook of Him they had no life; this adds, that whoever does so "hath eternal life."

and I will raise him up at the last day-For the fourth time this is repeated (see Joh 6:39, 40, 44)-showing most clearly that the "eternal life" which such a man "hath" cannot be the same with the future resurrection life from which it is carefully distinguished each time, but a life communicated here below immediately on believing (Joh 3:36; 5:24, 25); and giving to the resurrection of the body as that which consummates the redemption of the entire man, a prominence which in the current theology, it is to be feared, it has seldom had. (See Ro 8:23; 1Co 15:1-58, throughout).

Matthew Henry's Concise Commentary

6:52-59 The flesh and blood of the Son of man, denote the Redeemer in the nature of man; Christ and him crucified, and the redemption wrought out by him, with all the precious benefits of redemption; pardon of sin, acceptance with God, the way to the throne of grace, the promises of the covenant, and eternal life. These are called the flesh and blood of Christ, because they are purchased by the breaking his body, and the shedding of his blood. Also, because they are meat and drink to our souls. Eating this flesh and drinking this blood mean believing in Christ. We partake of Christ and his benefits by faith. The soul that rightly knows its state and wants, finds whatever can calm the conscience, and promote true holiness, in the redeemer, God manifest in the flesh. Meditating upon the cross of Christ gives life to our repentance, love, and gratitude. We live by him, as our bodies live by our food. We live by him, as the members by the head, the branches by the root: because he lives we shall live also.