The larger above ground cisterns would have likely held about forty gallons of water which is just over four "baths", (one bath is about nine and a half gallons). One measure in the above passage, (KJV "firkin"), is equal to one bath. Thus what the author is telling the reader is that these six stone cisterns contained between two or three baths apiece yet remaining in them. That means, if they were forty gallon cisterns, (four baths maximum), that they were still half to two thirds full with the water for the purification rites of the Yhudim. Does Yeshua tell the attendants to empty them of their contents before filling them to the brims with fresh water? Nope. So we see that the very FIRST miracle performed through Yeshua is this sign, turning water into wine, and wine clearly represents covenants. And yet here the master of ceremonies tells the groom that he had saved the good or best wine for last. And what does the good or best wine consist of? Two or three baths of the water of the purification rites of the Yhudim mixed with about one more bath of the fresh "living" water by the commandment of Yeshua to the attendants who simply did what he commanded them to do.
39 And no one having drunk old wine straightway desires new: for he says, "The old is chrestos!" [more gracious].
1) The number six is the number of creation and of man.
2) The cistern represents the heart or the chest cavity wherein is the heart.
3) The stone cistern represents the heart of stone of the unregenerated man.
4) The the "running water" that was mixed-added to the old represents water of life.
5) The wines obviously represent covenants and in this case they are clearly mixed.
6) The miracles, works, parables, sayings, and idioms of Yeshua all teach doctrine.
7) THIS IS THE VERY FIRST MIRACLE AND SIGN!
12 Be astonished, O ye heavens, at this, and be horribly afraid, be ye very desolate, says YHWH:
13 for My people have committed two evils; they have forsaken Me, the fountain of living waters, and have hewn of themselves cisterns, broken cisterns that can hold no water!
You are the cistern, O man!