John Gill Commentary John 6:50

"This is the bread which cometh down out of heaven, that a man may eat thereof, and not die." — John 6:50 (ASV)

This is the bread which cometh down from heaven
Namely, that of which he had spoken (John 6:32John 6:33John 6:35John 6:48) , meaning himself:

that a man may eat thereof, and not die ;
For this heavenly bread is soul quickening, soul strengthening, and soul satisfying food; nor can there be any want where this is: eating of it is not to be understood corporeally, as these Capernaites took it; nor sacramentally, as if it was confined to the ordinance of the Lord's supper, which was not, as yet, instituted; but more largely of eating and feeding upon Christ spiritually by faith.

He is, by the believer, to be fed upon wholly, and only; all of him, and none but him, and that daily; for there is the same need of daily bread for our souls, as for our bodies; and also largely and freely, as such may do; and likewise joyfully, with gladness and singleness of heart: such as are Christ's beloved, and his friends, "may" eat; they have liberty, a hearty welcome to eat; and so have everyone that have a will, an inclination, a desire to eat; and all overcomers, whom Christ makes more than conquerors, (Song of Solomon 5:1) (Revelation 2:7Revelation 2:17) (22:17) ; which liberty is owing to Christ's gracious invitation, and to his and the Father's free gift; and to the openness and ease of access of all sensible sinners to him.

And the consequence and effect of such eating is, that it secures from dying, not from a corporeal death, to which men are appointed, and saints themselves are subject; though it is indeed abolished by Christ as a penal evil; nor shall his people continue under the power of it, but shall rise again to everlasting life: but then they are, through eating this bread, secured from a spiritual death; for though there may be a decline, as to the exercise of grace, and a want of liveliness, and they may fear they are ready to die, and conclude they are free among the dead, and that their strength and hope are perished; yet he that lives and believes in Christ, the resurrection, and the life, shall never die; and such are also secure from an eternal death, on them the second death shall have no power, nor shall they ever be hurt by it.