John 6:53-60

And Jesus said to them, “I assure you and most solemnly say to you, unless you eat the flesh of the Son of Man and drink His blood [unless you believe in Me as Savior and believe in the saving power of My blood which will be shed for you], you do not have life in yourselves. The one who eats My flesh and drinks My blood [believes in Me, accepts Me as Savior] has eternal life [that is, now possesses it], and I will raise him up [from the dead] on the last day. For My flesh is true [spiritual] food, and My blood is true [spiritual] drink. He who eats My flesh and drinks My blood [believes in Me, accepts Me as Savior] remains in Me, and I [in the same way remain] in him. Just as the living Father sent Me, and I live because of the Father, even so the one who feeds on Me [believes in Me, accepts Me as Savior] will also live because of Me. This is the Bread which came down out of heaven. It is not like [the manna that] our fathers ate and they [eventually] died; the one who eats this Bread [believes in Me, accepts Me as Savior] will live forever.” He said these things in a synagogue while He was teaching in Capernaum. When many of His disciples heard this, they said, “This is a difficult and harsh and offensive statement. Who can [be expected to] listen to it?”