When he opened the third seal, I heard the third living creature say, "Come!" So I looked, and there was a black horse. Its rider held a balance for weighing in his hand.
I heard what sounded like a voice from among the four living creatures. It said, "A quart of wheat for a denarion, and three quarts of barley for a denarion, but don't damage the olive oil and the wine."
References for Revelation 6:6