Rev. 19:7-9—Let us rejoice and exult, and let us give the glory to Him, for the marriage of the Lamb has come, and His wife has made herself ready. And it was given to her that she should be clothed in fine linen, bright and clean; for the fine linen is the righteousnesses of the saints. And he said to me, Write, Blessed are they who are called to the marriage dinner of the Lamb. And he said to me, These are the true words of God.
For further reading please refer to CWWL, 1983, vol. 2, “Endeavoring to Learn and Propagate the Divine Truth for the Advance of the Lord’s Recovery,” ch. 4, p. 149 and ch. 5, p. 153.