But now is Christ risen from the dead, and become the firstfruits of them that slept. For since by man came death, by man came also the resurrection of the dead. For as in Adam all die, even so in Christ shall all be made alive. But every man in his own order: Christ the firstfruits; afterward they that are Christ's at his coming. (1 Corinthians 15:20-23)
Christ is the first to rise from the dead and therefore is referred to as the firstfruits of the resurrection:
Was Jesus INVISIBLE?
Behold my hands and my feet, that it is I myself: handle me, and see; for a spirit hath not flesh and bones, as ye see me have. (Luke 24:39)
The bible speaks of Jesus having a BODY that was clearly VISIBLE and FELT. However, His body was incorruptible and did not have the limitations that a normal body would have.
The word "FLESH" is used 5 different ways in the bible. It can mean:
1). The body or physical being.
2). The sin nature or old nature.
3). The skin
4). The immaterial nature of man.
5). Man's entire being
The word flesh used of Christ in Luke 24:39 referred to His BODY, however not corruptible. By the way the Docetic Gnostics was a sect that was against the bodily resurrection of Christ. The book of Colossians and 1st John combat this false teaching.
Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand; By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain. For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; And that he was buried, and that he rose again the third day according to the scriptures: And that he was seen of Cephas, then of the twelve: After that, he was seen of above five hundred brethren at once; of whom the greater part remain unto this present, but some are fallen asleep. After that, he was seen of James; then of all the apostles. And last of all he was seen of me also, as of one born out of due time. (1 Corinthians 151-8)
For we know that if our earthly house of this tabernacle were dissolved, we have a building of God, an house not made with hands, eternal in the heavens. (2 Corinthians 5:1)
Our earthly house is our corruptible bodies we have now, while our BUILDING will be our new incorruptible bodies. Hope this helps!