The month of July, in Catholic tradition, is dedicated to the Most Precious Blood of Our Lord Jesus Christ. In the old liturgical calendar, this feast of the Most Precious Blood of Our Lord Jesus Christ is celebrated on July 1st. And in the month of July, Christians have always recited the Litany of the Most Precious Blood of Jesus.
Pope St Clement I, the fourth bishop of Rome, wrote in his letter to the Corinthians: "Let us fix our gaze on the Blood of Christ and realize how truly precious It is, seeing that it was poured out for our salvation and brought the grace of conversion to the whole world." And Pope John XXIII, who wrote an apostolic letter On Promoting Devotion to the Most Precious Blood of Our Lord Jesus Christ, says that the highest form of worship and adoration is due to the Most Precious Blood and that “such worship achieves its normal fulfilment in sacramental communion with the same Blood, indissolubly united with Christ's eucharistic Body.” The Church has always taught that whenever we receive Holy Communion, even under the one species of bread, we also receive the Blood of Christ.
It is good, whenever you come to receive Holy Communion, to repeat these words in your heart: “The Body and Blood of our Lord Jesus Christ preserve my soul unto everlasting life. Amen." St John Chrysostom says that whenever we receive Holy Communion worthily, we become terrifying to the devil. Here is what he says: “Let us, then, come back from that table like lions breathing out fire, thus becoming terrifying to the Devil, and remaining mindful of our Head and of the love he has shown for us. . . This Blood, when worthily received, drives away demons and puts them at a distance from us, and even summons to us angels and the Lord of angels. . . This Blood, poured out in abundance, has washed the whole world clean. . . This is the price of the world; by it Christ purchased the Church... This thought will check in us unruly passions. How long, in truth, shall we be attached to present things? How long shall we remain asleep? How long shall we not take thought for our own salvation? Let us remember what privileges God has bestowed on us, let us give thanks, let us glorify him, not only by faith, but also by our very works.”
The English saint, the Venerable Mother Mary Potter wrote that: “One of the best means of participating in the graces and blessings of the Precious Blood is to offer It to the Eternal Father.” And the Italian saint, St. Mary Magdalen de Pazzi, when in ecstasy, once exclaimed: "Every time a creature offers up the Blood by which he was redeemed, he offers a gift of infinite worth, which can be equalled by no other." In fact, God complained to this saint that so little effort is made in this world to appease His Divine justice against sinners. As a result, St Mary Magdalen de Pazzi began the practice of offering daily the Precious Blood fifty times for the living and the dead. She did this with so much fervour that God showed her on different occasions the numerous souls who had thereby been converted or delivered from Purgatory.
You too can also adopt this practice and offer the Precious Blood for the salvation of a particular soul. You can even use this little prayer: Eternal Father, I offer Thee the most Precious Blood of Jesus Christ, in satisfaction for my sins, in supplication for the holy souls in Purgatory and for the needs of Holy Church [especially for the soul of (Name)] and you name the particular person you have in mind.
It is also related that in the life of St. Dominic on one occasion when he was preaching about the veneration of Mary, he saw the Blessed Virgin sprinkling his devout hearers with the Blood of her Divine Son. And on another occasion, while the Saint was celebrating Mass, three hundred persons saw the Mother of God, at the elevation of the chalice, pouring the Precious Blood over all present and over the whole Church.
Let us beseech the Blessed Virgin Mary, especially whenever we at Mass, to offer to the Eternal Father the Blood of her Son in the chalice, for the holy Catholic Church, for the conversion of sinners, for the souls in Purgatory and for our various needs.