Giovanni 19:35

And he that saw it bare record, and his record is true: and he knoweth that he saith true, that ye might believe. He that saw it - Most probably John himself, who must have been pretty near the cross to have been able to distinguish between the blood and the water, as they issued from the side of our blessed Lord.

And he knoweth - This appears to be an appeal to the Lord Jesus, for the truth of the testimony which he had now delivered. But why such a solemn appeal, unless there was something miraculous in this matter? It might appear to him necessary:

1. Because the other evangelists had not noticed it.

2. Because it contained the most decisive proof of the death of Christ: as a wound such as this was could not have been inflicted, (though other causes had been wanting), without occasioning the death of the person; and on his dying for men depended the salvation of the world. And,

3. Because two important prophecies were fulfilled by this very circumstance, both of which designated more particularly the person of the Messiah. A bone of him shall not be broken, Esodo 12:46; Numeri 9:12; Salmi 34:20.

They shall look upon him whom they pierced, Sofonia 12:10; Salmi 22:16.