Let us be glad and rejoice in his salvation. Let's look at the detail in this story. Now there were standing six stone jars for the Jewish rites of purification. Stone jars in contrast to earthen jars are free from Levitical impurity. That the jars were made of stone rather than clay ensured the purity of the waters used for the Jewish practice of ceremonial washing before and after meals.
Any earthen vessel is unclean.
If anything falls into it, you shall break the vessel. These vessels were made of stone and therefore clean. They were also empty. That these same clean empty jars used for the Jewish rituals of purification will soon be filled with wine signifies that something new indeed is at hand. Even taking into account the possibility of a large gathering at the wedding, the quantity and capacity of the stone jars is unusual.