John Calvin Commentary 1 Corinthians 15:50

"Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption." — 1 Corinthians 15:50 (ASV)

Now this I say This clause indicates that what follows is explanatory of the previous statement. “What I have said regarding bearing the image of the heavenly Adam means this—that we must be renewed with respect to our bodies, since our bodies, being subject to corruption, cannot inherit God’s incorruptible kingdom. Therefore, there will be no admission for us into the kingdom of Christ, except through Christ’s renewing us after His own image.”

Flesh and blood, however, we must understand according to the condition in which they are at present, because our flesh will be a participant in the glory of God, but it will be—as renewed and made alive by the Spirit of Christ.