The sting of death is sin, and the power of sin is the law.
56. The sting of death is sin In other words, “Death has no dart with which to wound us except sin, since death proceeds from the anger of God. Now it is only with our sins that God is angry. Take away sin, therefore, and death will no more be able to harm us.” This agrees with what he said in Romans 6:23, that the wages of sin is death.
To confirm what he had said of this change, I. He here tells them what had been concealed from or unknown to them till then - that all the saints would not die, but all would be changed. Those that are alive at our Lord's coming will be caught up into the clouds, without dying, Th1 4:11.
Commenting on 1 Corinthians 15:51-57
Verse 56. The sting of death. The sting which death bears; that with which he effects his: purpose; that which is made use of to inflict death; or that which is the cause of death. There would be no death without sin.