My flesh is real food and my blood is real drink
The Jews started arguing with one another: ‘How can this man give us his flesh to eat?’ they said. Jesus replied:
‘I tell you most solemnly,
if you do not eat the flesh of the Son of Man and drink his blood,
you will not have life in you.
Anyone who does eat my flesh and drink my blood
has eternal life,
and I shall raise him up on the last day.
For my flesh is real food
and my blood is real drink.
He who eats my flesh and drinks my blood
lives in me
and I live in him.
As I, who am sent by the living Father,
myself draw life from the Father,
so whoever eats me will draw life from me.
This is the bread come down from heaven;
not like the bread our ancestors ate:
they are dead,
but anyone who eats this bread will live for ever.’
He taught this doctrine at Capernaum, in the synagogue.
Source: Jerusalem Bible
Catechism of the Catholic Church
“Take this and eat it, all of you”: communion
1384 The Lord addresses an invitation to us, urging us to receive him in the sacrament of the Eucharist: “Truly, I say to you, unless you eat the flesh of the Son of man and drink his blood, you have no life in you.”
1385 To respond to this invitation we must prepare ourselves for so great and so holy a moment. St. Paul urges us to examine our conscience: “Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of profaning the body and blood of the Lord. Let a man examine himself, and so eat of the bread and drink of the cup. For any one who eats and drinks without discerning the body eats and drinks judgment upon himself.” Anyone conscious of a grave sin must receive the sacrament of Reconciliation before coming to communion.
1386 Before so great a sacrament, the faithful can only echo humbly and with ardent faith the words of the Centurion: “Domine, non sum dignus ut intres sub tectum meum, sed tantum dic verbo, et sanabitur anima mea” (“Lord, I am not worthy that you should enter under my roof, but only say the word and my soul will be healed.”). And in the Divine Liturgy of St. John Chrysostom the faithful pray in the same spirit:
O Son of God, bring me into communion today with your mystical supper. I shall not tell your enemies the secret, nor kiss you with Judas’ kiss. But like the good thief I cry, “Jesus, remember me when you come into your kingdom.”
1387 To prepare for worthy reception of this sacrament, the faithful should observe the fast required in their Church. Bodily demeanor (gestures, clothing) ought to convey the respect, solemnity, and joy of this moment when Christ becomes our guest.
1388 It is in keeping with the very meaning of the Eucharist that the faithful, if they have the required dispositions, receive communion when they participate in the Mass. As the Second Vatican Council says: “That more perfect form of participation in the Mass whereby the faithful, after the priest’s communion, receive the Lord’s Body from the same sacrifice, is warmly recommended.”
1389 The Church obliges the faithful to take part in the Divine Liturgy on Sundays and feast days and, prepared by the sacrament of Reconciliation, to receive the Eucharist at least once a year, if possible during the Easter season. But the Church strongly encourages the faithful to receive the holy Eucharist on Sundays and feast days, or more often still, even daily.
1390 Since Christ is sacramentally present under each of the species, communion under the species of bread alone makes it possible to receive all the fruit of Eucharistic grace. For pastoral reasons this manner of receiving communion has been legitimately established as the most common form in the Latin rite. But “the sign of communion is more complete when given under both kinds, since in that form the sign of the Eucharistic meal appears more clearly.” This is the usual form of receiving communion in the Eastern rites.
I love the LORD, who listened to my voice in supplication,
Who turned an ear to me on the day I called.
I was caught by the cords of death; the snares of Sheol had seized me; I felt agony and dread.
Then I called on the name of the LORD, “O LORD, save my life!”
Gracious is the LORD and just; yes, our God is merciful.
The LORD protects the simple; I was helpless, but God saved me.
Return, my soul, to your rest; the LORD has been good to you.
For my soul has been freed from death, my eyes from tears, my feet from stumbling.
I shall walk before the LORD in the land of the living.
I kept faith, even when I said, “I am greatly afflicted!”
I said in my alarm, “No one can be trusted!”
How can I repay the LORD for all the good done for me?
I will raise the cup of salvation and call on the name of the LORD.
I will pay my vows to the LORD in the presence of all his people.
Too costly in the eyes of the LORD is the death of his faithful.
LORD, I am your servant, your servant, the child of your maidservant; you have loosed my bonds.
I will offer a sacrifice of thanksgiving and call on the name of the LORD.
I will pay my vows to the LORD in the presence of all his people,
In the courts of the house of the LORD, in your midst, O Jerusalem. Hallelujah!
Source: The New American Bible