John Lightfoot on John 19:34

[With a spear pierced his side.] The Arabic version of the Erpenian edition adds the word, he pierced his right side; afraid (as it should seem) lest the miracle should not be great enough, if the blood and water should have been supposed to have issued from his left side because of the water that is said to be contained in the pericardium: which being pierced, it is conceived blood and water could not but upon natural reasons flow out of it. But this issue of blood and water had something of mystery in it beyond nature: if nothing preternatural had been in it, I hardly imagine the evangelist would have used that threefold asseveration concerning the truth of the thing as we see he doth; "And he that saw it bare record," &c.

[Came there out blood and water.] It is commonly said that the two sacraments of the new testament, water and blood, flowed out of this wound: but I would rather say that the antitype of the old testament might be here seen.

I. The apostle teacheth us that the ratification of the old covenant was by blood and water, Hebrews 9:19; "Moses took the blood of calves and of goats, with water," &c. I confess, indeed, that Moses makes no mention of water, Exodus 24: but the apostle, writing to the Hebrews, does not write without such authority as they could not tell how to gainsay. And if my memory do not fail me, I think I have read somewhere among some of the Jewish authors (but the place itself has unhappily slipped from me), that when there was some pause to be made betwixt the slaying of the sacrifice and the sprinkling of the blood upon the altar (such a kind of pause as Moses made when he read to the people the articles of their covenant), they mingled water with the blood, lest it should congeal and coagulate. However, the authority is sufficient that the apostle tells us that the first testament was dedicated by blood and water. The antitype of which is clearly exhibited in this ratification of the new testament: and hence it is that the evangelist, by so vehement asseverations, confirms the truth of this passage, because it so plainly answers the type, and gives such assurance of the fulfilling of it.

II. It must not by any means let pass that in Shemoth Rabba; "'He smote the rock, and the waters gushed out,' Psalm 78:20, but the word yod-zayin-vav-bet- yod signifies nothing else but blood; as it is said, 'The woman that hath an issue of blood upon her,' Leviticus 15:20. Moses therefore smote the rock twice, and first it gushed out blood, then water."

"That rock was Christ," 1 Corinthians 10:4. Compare these two together: Moses smote the rock, and blood and water, saith the Jew, flowed out thence: the soldier pierced our Saviour's side with a spear, and water and blood, saith the evangelist, flowed thence.

St. John concludes this asseveration of his, that ye might believe. It is not without moment what is commonly said, viz. that by this flowing out of water and blood, it is evident his pericardium was pierced; and so there was an undoubted assurance given of his death: but I hardly believe the evangelist in this clause had any direct eye towards it; for would he be so vehement in asserting, "He that saw bare record: and he knoweth that he saith true, that ye might believe" that Jesus was indeed dead? Surely there was no need of such mighty asseverations for that. Questionless, therefore, he would intimate something else, viz. that you may believe that this is the true blood of the new covenant, which so directly answers the type in the confirmation of the old. Nor do I think that the water itself, which issued from his side, was that only which was contained in the pericardium, but that something supernatural was in this matter.