1. Leviticus 17:11 (ESV)
  2. Exposition

What is the first reason for this prohibition?

Leviticus 17:11 (ESV)

11 For the life of the flesh is in the blood, and I have given it for you on the altar to make atonement for your souls, for it is the blood that makes atonement by the life.

Blood is the source and animating force of life. As such, it is to be honoured and respected as the element that contains life in it.