A Powerful Prayer to be said before praying:
"Almighty Father,
I place the Precious Blood of Jesus before my lips before I pray, that my prayers may be purified before they ascend to Your divine altar."
~St. Mary Magdalen de Pazzi. Carmelite
The Bath of the Dove
Taste and see how good is the Lord
to those who love him.
Letaille, Paris

The Blood of Jesus Christ
Lejeune, Paris
The Blood of Jesus Christ
Lejeune, Paris
Source of Life, delicious beverage, you give immortality.

It is the Blood of the Son of God
that opens for us the door of heaven. 
Blot, Paris

Precious Blood
of Jesus Christ,
flow over my soul.

The blood of Jesus revivifies the earth.
Precious Blood of our Redeemer, 
it is by you that our souls will be saved.
The soul sprinkled with the tears of the Heart of Jesus
will, by its sweet fragrance, enrapture the Church on earth and in heaven. 
May your Precious Blood purify my soul.

O, My Savior Jesus Christ

O, My Savior Jesus Christ, only object of my desires.

Basilica of the Precious Blood in Bruges

At Passover in the Old Testament, the blood of the lamb was smeared on the door posts of the Hebrew people as the sign for the angel of death to passover their homes.

The blood of Jesus Christ cleanses us from all sin.

I found this interesting connection when looking up the word "Messiah"
in a Jewish web site Ancient Hebrew Word Meanings
This word comes from the root mashahh meaning "to smear" as in Jeremiah 22:14
where it is usually translated as 'painted'.
in the ancient world olive oil was ...used as a medicine as it is a disinfectant,
no shepherd was without a flask of olive oil which he
smeared on his sheep's injuries."