A.T. Robertson Commentary 1 Corinthians 15:53

"For this corruptible must put on incorruption, and this mortal must put on immortality." — 1 Corinthians 15:53 (ASV)

Must put on (δε ενδυσασθα). Aorist (ingressive) middle infinitive, put on as a garment.

Immortality (αθανασιαν). Old word from αθανατος, undying, and that from α privative and θνησκω, to die. In N.T. only here and 1 Timothy 6:16 where God is described as having immortality.