John 6:53-54

53And 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.

54The 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.