Bodiless souls exists after death before the resurrection

By these things, then, it is plainly declared that souls continue to exist that they do not pass from body to body, that they possess the form of a man, so that they may be recognized, and retain the memory of things in this world; moreover, that the gift of prophecy was possessed by Abraham, and that each class [of souls] receives a habitation such as it has deserved, even before the judgment.

Irenaeus of Lyons
Against Heresies, Book II
Chapter XXXIV

Resurrection is a resuscitation of our same bodies

And then the doctrine concerning the resurrection of bodies which we believe, will emerge true and certain [from their system]; since, [as we hold,] God, when He resuscitates our mortal bodies which preserved righteousness, will render them incorruptible and immortal.

Irenaeus of Lyons
Against Heresies, Book II
Chapter XXIX

Jesus, the first-born form the dead, existed before all

Then, at last, He came on to death itself, that He might be “the first-born from the dead, that in all things He might have the pre-eminence,” the Prince of life, existing before all, and going before all.

Irenaeus of Lyons
Against Heresies, Book II
Chapter XXII

Jesus sanctified humanity having lived the full human experience

For He came to save all through means of Himself—all, I say, who through Him are born again to God—infants, and children, and boys, and youths, and old men. He therefore passed through every age, becoming an infant for infants, thus sanctifying infants; a child for children, thus sanctifying those who are of this age, being at the same time made to them an example of piety, righteousness, and submission; a youth for youths, becoming an example to youths, and thus sanctifying them for the Lord. So likewise He was an old man for old men, that He might be a perfect Master for all, not merely as respects the setting forth of the truth, but also as regards age, sanctifying at the same time the aged also, and becoming an example to them likewise.

Irenaeus of Lyons
Against Heresies, Book II
Chapter XXII

Only one God, the Creator

How much safer and more accurate a course is it, then, to confess at once that which is true: that this God, the Creator, who formed the world, is the only God, and that there is no other God besides Him—He Himself receiving from Himself the model and figure of those things which have been made—than that, after wearying ourselves with such an impious and circuitous description, we should be compelled, at some point or another, to fix the mind on some One, and to confess that from Him proceeded the configuration of things created.

Irenaeus of Lyons
Against Heresies, Book II
Chapter XVI