When He opened the third seal, I heard the third living creature say, "Come!" And I looked, and there was a black horse. The horseman on it had a balance scale in his hand.
References for Revelation 6:5
Then I heard something like a voice among the four living creatures say, "A quart of wheat for a denarius, and three quarts of barley for a denarius-but do not harm the olive oil and the wine."