For this corruptible must put on incorruption, and this mortal must put on immortality.
This - pointing to his own and their body.
Put on - as a garment (2 Corinthians 5:2-3).
Immortality - athanasia (G110). Here only, besides 1 Timothy 6:16, the word "immortality" is found (note, 1 Corinthians 15:19). The immortality of the soul, distinct from the body, is a notion derived from pagan philosophers. Scripture does not contemplate the anomalous state brought by death as the consummation to be looked for (2 Corinthians 5:4), but the resurrection.