The people are required to make certain offerings and are invited to make others. All of these offerings are to be handled with special care and not treated as ordinary food. Here Moses is warning specifically against pagan magical practice. It is believed by them that the life force, qualities, and powers of an animal can be taken over by consuming its blood, particularly as it flows from its body. The pagan nations look for power within the created order, and they try to tap into that power through fertility rites and other magical acts. All the blessings of life, fertility, and abundance are to be found in obedient relationship to the Lord. They can’t be obtained by trying to manipulate the forces of the natural world.