Revelation 3:4-5

3:4 But you have a few individuals in Sardis who have not stained their clothes, and they will walk with me dressed in white, because they are worthy. 3:5 The one who conquers will be dressed like them in white clothing, and I will never erase his name from the book of life, but will declare his name before my Father and before his angels.

Revelation 3:18

3:18 take my advice and buy gold from me refined by fire so you can become rich! Buy from me white clothing so you can be clothed and your shameful nakedness will not be exposed, and buy eye salve to put on your eyes so you can see!