Our Jesus declares himself to be our necessary food.(John 6:27, 47-58) He is speaking of the necessary food that is the essential nourishment of Eternal Life! His body and blood is so vital, that in verse 53 He says, " I say unto you except you eat the flesh of the Son of Man, and drink His blood, you have no life in you."
The physical elements of His commanded feast (Mt. 26:28; 1 Cor. 11:25) are to draw us to the continual reminder of the spiritual meal that we must feast upon, His Perfect Body and Blood, prepared by the Father(Hebrews 10:5) that ALONE can sustain the Eternal Life freely given us upon belief in the Sent One, our Jesus(John 6:29). He is our Righteous Man, the One the Father requires, that wasn’t to be found throughout the Old Covenant (Isa. 59:16, 63:5, Ezek. 22:30). Our Jesus ALONE could Do and Possess the Righteousness that is ALONE the Delight of God (Ps.40:6-8) and Pleasure of the Father.(Mt. 3:16-17, 17:1-5) He is all that we could not be and has done all that we could not do!!! And on top of that, He has paid the penalty required by the just Righteousness of God for all that we could not be or do (2 Cor. 5:21)
By faith alone, we must feast upon the Lamb of God, our Passover Lamb, who ALONE provides the two-fold benefit that we must have. He has kept the death angel from our door,(Heb. 2:14-15) and He is our needed food for the treacherous journey through the wilderness of this fallen world(Gal.2:20). He ALONE can sustain us unto the Glorious inheritance(Eph. 1:17-21) of the Eternal Promised Land, of which Peter speaks of in 2 Peter 3:11-13, a new Heaven and a new Earth where Righteousness dwells. And that Righteousness which dwells there is the very Presence of our Righteous Loving Father and His Beloved Son by the Power and Love of His Glorious Spirit.
But Wonder of wonders, by faith alone, we have access into that Glorious Holy of Holies right now. Hebrews chapter 10 presents to us the incredible truth that we are called to enter into the Holiest by the Blood of Jesus even now, by a New and Living Way which Jesus has consecrated for us through the veil that is to say His Flesh, (that is body the Father prepared for Him Vs 10:5), and having a High Priest(Heb. 7:24-25) over the House of God (Heb. 3:5, that is, all who have come to God through Him,) let us draw near with a true heart in full assurance of faith having our hearts sprinkled from an evil conscience and our bodies washed with pure water.”
And how do we feast continually upon this necessary food? Our Lord hasn't left us guessing, for he says in John 6: 35, " and Jesus said unto them, I am the bread of life: he that comes to Me shall never hunger and he that believes in Me shall never thirst." Coming and believing is but the response of faith, faith alone that believes that this God/Man Christ Jesus was sent by God His Father as the Righteousness of God that ALONE satisfies the Father's Will in Heaven and upon the Earth. As a dear old saint once said, "Join anything of your own to Christ and you un-Christ him. God will look at nothing but Christ, and you must look at nothing else. He is the Savior, and there is none beside him. Look anywhere else and you are undone, and that eternally."