To sain someone or something is a Scottish method of ritually cleansing and blessing. This spell simultaneously spiritually cleanses and blesses an area and all participants alike:
Collect Holy Water, defined in this circumstance as water collect from a local spring or other nearby source of living water, between midnight and dawn, coinciding with a waxing moon.
All participants should gather in a circle.
Pass the water [clockwise] for each person to sip and sprinkle over themselves. (It may be more practical for each person to sprinkle their neighbor.)
Sprinkle the water in each corner of each room.
(from The Element Encyclopedia of 5,000 Spells by Judika Illes)