Exodus
30:22: ”Then the Lord said to Moses, 23 “Take the following fine spices: 500 shekels of liquid myrrh, half as much (that is, 250 shekels) of fragrant cinnamon, 250 shekels of fragrant calamus, 24 500 shekels of cassia—all according to the sanctuary shekel—and a hin of olive oil. 25 Make these into a sacred anointing oil, a fragrant blend, the work of a perfumer. It will be the sacred anointing oil.”
This passage from the book of Exodus describes the recipe for holy anointing oil, which was to be used to anoint the priests as well as the tabernacle and everything in it.
As it turns out, what is translated as ’calamus’ actually comes from the hebrew term ”kaneh bosm”. The scholar Sula Benet claimed in the 1930’s that the real translation was actually ’cannabis’. It does fit a lot better than calamus as cannabis is extremely medically effective and has the spiritual effects attributed to the oil. It also makes sense as cannabinoids are fat soluble and the recipe instructs to put these ingredients in olive oil, which would allow cannabinoids to be taken up through the skin.
It is also supported by this ancient temple in Israel, which was found to have cannabis residue.
In the old testament the use of the oil was forbidden for commoners and only allowed for these sacred purposes. It seems strongly likely, however, that Jesus and his followers used the oil to heal people from physical and mental/spiritual ailments, as this passage from the gospel of Mark mentions. The word ’messiah’, by the way, literally means ”the anointed one’.
Chris Bennett has popularized this theory in modern times. Here’s a page laying out the details, and here’s a video on the subject.