"I John] was in the Spirit on the Lord's day" (Rev. 1:10). "The Lord's day" here is a state of mind in which we have released our own personal thoughts and activities, and rest in the realization that we have touched the mind of Spirit. Getting into Spirit is getting into the consciousness that we can and do understand the things of Spirit--the revelations of Spirit. The Lord's day is the day of illumination.
The "three days" of John 2:19 are the three degrees or parts of man's consciousness: spirit, soul, body. When I AM has purified and mastered these three in a person, he is in that dominion proclaimed for him in the 1st chapter of Genesis; then the Scripture, or word of God, is fulfilled in him and his faculties (disciples) recognize and respond to it every time that the lifting up word (resurrection) is proclaimed.