Quick now, no peeking...
Revelation 19:7-8 starts,
Let us rejoice and be glad and give the glory to Him, for the marriage of the Lamb has come and His bride has made herself ready. It was given to her to clothe herself in fine linen, bright and clean, for the fine linen is _________.
Now the test: how does the verse end? What is the "fine linen, bright and clean" of the bride of Christ by which she has made herself ready for the Lamb? And now that you've looked it up, is the answer what you expected?