John Gill Commentary Zechariah 6:4

"Then I answered and said unto the angel that talked with me, What are these, my lord?" — Zechariah 6:4 (ASV)

Then I answered and said to the angel that spoke with
me
After he had seen the chariots come out, and had observed the different colours of the horses in them:what [are] these, my lord ?
that is, what do they signify? what is the meaning of this vision?