It is in fact not found in any of the Holy Scriptures. It is a heresy of the Roman Catholic Church.
*“The use of holy water in the earliest days of the Christian Era is attested by documents of only comparatively late date. The “Apostolic Constitutions,” the redaction of which goes back to about the year 400, attribute to the Apostle St. Matthew the precept of using holy water. The letter written under the name of Pope Alexander I, who lived in the second century, is apocryphal and of more recent times; hence the first historical testimony does not go back beyond the fifth century. However, it is permissible to suppose for the sake of argument that, in the earliest Christian times, water was used for expiatory and purificatory purposes, to a way analogous to its employment under the Jewish Law.”
*(http://www.newadvent.org) emphasis added.
In fact, some eastern religions, Lutherans, Anglicans and Methodists employ the use of so-called Holy Water.
**“In Ancient Greek religion, a holy water called chernips (Greek: χέρνιψ) was created when a torch from a religious shrine was extinguished in it. In Greek religion, purifying people and locations with water was part of the process of distinguishing the sacred from the profane.
The Book of Numbers mentions using water in a test for the purity of a wife accused of marital infidelity. A ritual would be performed involving the drinking of water. If she participated in the ceremony, and she was guilty, she is supposedly cursed to miscarry any pregnancy. If she was still able to bear children, then she was presumed innocent.
Sikhs use the Punjabi term amrita (ਅੰਮ੍ਰਿਤ) for the holy water used in the baptism ceremony known as Amrit Sanskar or Amrit Chhakhna.
In Wicca and other ceremonial magic traditions a similar substance is produced when salt is mixed with water. It is consecrated and used in many religious ceremonies and rituals.
Bathing in holy water is an essential element in Hinduism, and the Ganges is considered the most sacred Hindu river.’
The Book of Numbers mentioning the use of water for purification was of Old Testament Jewish purification law and has been abolished since the New Covenant of Jesus Christ. And that means nothing today when the Roman Catholic Church professes to be still under the Law!
Numbers 8:7 (ESV) 7 Thus you shall do to them to cleanse them: sprinkle the water of purification upon them, and let them go with a razor over all their body, and wash their clothes and cleanse themselves.
Please pray for the Roman Catholic and all others that rely on such heretical ceremonies! We are saved by faith alone!
Romans 4: 5 5 But to the one who does not work, but believes in Him who justifies the ungodly, his faith is credited as righteousness,