1 Corinthians 3:12-13

3:12 If anyone builds on the foundation with gold, silver, precious stones, wood, hay, or straw, 3:13 each builder’s work will be plainly seen, for the Day will make it clear, because it will be revealed by fire. And the fire will test what kind of work each has done.

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!