'Fire brands' in the Bible

Say to him: Calm down and be quiet. Don’t be afraid or cowardly because of these two smoldering stubs of firebrands, the fierce anger of Rezin and Aram, and the son of Remaliah.

Look, all you who kindle a fire,who encircle yourselves with firebrands;walk in the light of your fireand in the firebrands you have lit!This is what you’ll get from My hand:you will lie down in a place of torment.