Apocalypse of Peter (Early 2nd Century):
[Jesus speaking] Behold now what shall come upon them in the last days, when the day of God and the day of the decision of the judgement of God cometh. From the east unto the west shall all the children of men be gathered together before my Father that liveth for ever. And he shall command hell to open its bars of adamant and give up all that is therein.
And the wild beasts and the fowls shall he command to restore all the flesh that they have devoured, because he willeth that men should appear; for nothing perisheth before God, and nothing is impossible with him, because all things are his.
For all things come to pass on the day of decision, on the day of judgement, at the word of God: and as all things were done when he created the world and commanded all that is therein and it was done -even so shall it be in the last days; for all things are possible with God. And therefore saith he in the scripture: [Ezek. xxxvii.] Son of man, prophesy upon the several bones and say unto the bones: bone unto bone in joints, sinew. nerves, flesh and skin and hair thereon [and soul and spirit].
And soul and spirit shall the great Uriel give them at the commandment of God; for him hath God set over the rising again of the dead at the day of judgement.
Behold and consider the corns of wheat that are sown in the earth. As things dry and without soul do men sow them in the earth: and they live again and bear fruit, and the earth restoreth them as a pledge entrusted unto it.
And this that dieth, that is sown as seed in the earth, and shall become alive and be restored unto life, is man.
How much more shall God raise up on the day of decision them that believe in him and are chosen of him, for whose sake he made the world? And all things shall the earth restore on the day of decision, for it also shall be judged with them, and the heaven with it.
Justin Martyr’s On the Resurrection (Mid-2nd Century) Chapter 4:
For if on earth He healed the sicknesses of the flesh, and made the body whole, much more will He do this in the resurrection, so that the flesh shall rise perfect and entire.
Justin Martyr’s On the Resurrection (Mid-2nd Century) Chapter 8:
It is evident, therefore, that man made in the image of God was of flesh. Is it not, then, absurd to say, that the flesh made by God in His own image is contemptible, and worth nothing? But that the flesh is with God a precious possession is manifest, first from its being formed by Him, if at least the image is valuable to the former and artist; and besides, its value can be gathered from the creation of the rest of the world. For that on account of which the rest is made, is the most precious of all to the maker.
Justin Martyr’s Dialog with Trypho (Mid-2nd Century) Chapter 80:
If you have fallen in with some who are called Christians, but who do not admit this[truth], and venture to blaspheme the God of Abraham, and the God of Isaac, and the God of Jacob; who say there is no resurrection of the dead, and that their souls, when they die, are taken to heaven; do not imagine that they are Christians…But I and others, who are right-minded Christians on all points, are assured that there will be a resurrection of the dead, and a thousand years in Jerusalem, which will then be built, adorned, and enlarged, the prophets Ezekiel and Isaiah and others declare.
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Find more of what the early Christians thought on my Christian History page!