Traditional Catholic Prayers: January 1 is the Feast of the Circumcision - January 6 Epiphany

See: Traditional Catholic Prayers: January 1 is the Feast of the Circumcision - Eternal Faith & Beliefs « BellesHeures's Weblog

The Epiphany is when the Holy and undivided Trinity appeared to confirm the beginning of Our Lord and Saviour Jesus Christ's public mission for the next, the last, three and one-quarter years of His earthly life. That mission was for one objective, which is the salvation of those who believe in Him. He came to exhaust the sins of those are redeemed by His Most Holy Cross. Just as His Circumcision was His first shedding of blood for us, so His Cross is the last. There will never be NOR could there be another sacrifice by which the redeemed are saved.

Eternal redemption. . . By that one sacrifice of his blood, once offered on the cross, Christ our Lord paid and exhibited, once for all, the general price and ransom of all mankind: which no other priest could do. For He alone is our High Priest and the only priest to whom we owe obedience.

Hebrews Chapter 9

The sacrifices of the law were far inferior to that of Christ.

9:13 For if the blood of goats and of oxen, and the ashes of an heifer, being sprinkled, sanctify such as are defiled, to the cleansing of the flesh:
9:14 How much more shall the blood of Christ, who by the Holy Ghost offered himself unspotted unto God, cleanse our conscience from dead works, to serve the living God?
9:15 And therefore he is the mediator of the new testament: that by means of his death for the redemption of those transgressions which were under the former testament, they that are called may receive the promise of eternal inheritance.
9:16 For where there is a testament the death of the testator must of necessity come in.
9:17 For a testament is of force after men are dead: otherwise it is as yet of no strength, whilst the testator liveth.
9:18 Whereupon neither was the first indeed dedicated without blood.
9:19 For when every commandment of the law had been read by Moses to all the people, he took the blood of calves and goats, with water, and scarlet wool and hyssop, and sprinkled both the book itself and all the people.
9:20 Saying: This is the blood of the testament which God hath enjoined unto you.
9:21 The tabernacle also and all the vessels of the ministry, in like manner, he sprinkled with blood.
9:22 And almost all things, according to the law, are cleansed with blood: and without shedding of blood there is no remission.
9:23 It is necessary therefore that the patterns of heavenly things should be cleansed with these: but the heavenly things themselves with better sacrifices than these.
9:24 For Jesus is not entered into the Holies made with hands, the patterns of the true: but into Heaven itself, that he may appear now in the presence of God for us.
9:25 Nor yet that he should offer himself often, as the high priest entereth into the Holies every year with the blood of others:

Offer himself often. . . Christ shall never more offer himself in sacrifice, in that violent, painful, and bloody manner, nor can there be any occasion for it: since by that one sacrifice upon His Cross, he has furnished the full ransom, redemption, and remedy for all the sins of the world. But this hinders not that He, by the Holy Spirit, makes Himself daily present in the sacred Eucharist in the bread and cup given us by God and His power alone and not by any pretended power of men, that sacred Presence whom we receive in faith with all thanksgiving.

9:26 For then he ought to have suffered often from the beginning of the world. But now once, at the end of ages, he hath appeared for the destruction of sin by the sacrifice of himself.
9:27 And as it is appointed unto men once to die, and after this the judgment:
9:28 So also Christ was offered once to exhaust the sins of many. The second time he shall appear without sin to them that expect him unto salvation.

Muslims are encouraged to come to Christ, who they already confess as the Messiah, as Islam in the Holy Qur'an teaches, just as the Holy Bible teaches, and receive baptism in Christ and come to the Lord's table and receive the Eucharist. (See: The Final Trial)

To exhaust. . .That is, to empty, or draw out to the very bottom, by a plentiful and perfect redemption.

Second time. . .The Parousia, Nuzul i Isa in Arabic, the Second Coming of Christ from heaven with all the elect angels of God.

Jesus Christ said:

John 6:55
He that eateth my flesh, and drinketh my blood, hath everlasting life: and I will raise him up in the last day.

Matthew 26:28
For this is my blood of the new testament, which shall be shed for many unto remission of sins.