Marriage Is Honorable Among All Things.
Marriage is honorable among all, and the bed undefiled; but fornicators and adulterers God will judge. Hebrews 13:4 NKJV
To purity and chastity: Here you have a recommendation of God's ordinance of marriage, that it is honourable in all, and ought to be so esteemed by all, and not denied to those to whom God has not denied it. It is honourable, for God instituted it for man in paradise, knowing it was not good for him to be alone. He married and blessed the first couple, the first parents of mankind, to direct all to look unto God in that great concern, and to marry in the Lord. Christ honoured marriage with his presence and first miracle. It is honourable as a means to prevent impurity and a defiled bed. It is honourable and happy, when persons come together pure and chaste, and preserve the marriage bed undefiled, not only from unlawful but inordinate affections.
A dreadful but just censure of impurity and lewdness: Whoremongers and adulterers God will judge.
God knows who are guilty of such sins, no darkness can hide them from him.
He will call such sins by their proper names, not by the names of love and gallantry, but of whoredom and adultery, whoredom in the single state and adultery in the married state.
He will bring them into judgment, he will judge them, either by their own consciences here, and set their sins in order before them for their deep humiliation (and conscience, when awakened, will be very severe upon such sinners), or he will set them at his tribunal at death, and in the last day he will convict them, condemn them, and cast them out for ever, if they die under the guilt of this sin. - Matthew Henry