[Some of] the Jewish friends then said, “Look how [much] he loved him!” [See verse 3].
Then said the Jews, Behold how he loved him!
The Jews said, See how [tenderly] He loved him!
The Jews therefore said, Behold how he loved him!
The Jews said, “See how much he loved him!”
Therefore, the Jews said, "See how much he loved him!"
The Jews therefore said: Behold how he loved him.