How did God appear to Abraham in Genesis 18?
God appeared to Abraham in human form in Genesis 18 as the I AM, the Jehovah of the Old Testament. Abraham prepared a fatted calf and a meal, and the I AM actually sat down and partook of that meal. This provides a clear Old Testament example of God appearing in human form.
Les explains that in a further revelation God revealed Himself to Abraham. Genesis 18 is a good example of God appearing in human form in the Old Testament. Abraham prepared the fatted calf and the meal, and the I AM, the Jehovah of the Old Testament, actually sat down and partook of that meal. Les contrasts this with Exodus 3, where God appeared in the burning bush not in human form but by way of a human voice. Even though He is separated out of the Godhead as the Jehovah, as God the Son, He is still God.