47 Or “the Jewish authorities”; Grk “the Jews.” In NT usage the term Ἰουδαῖοι (Ioudaioi) may refer to the entire Jewish people, the residents of Jerusalem and surrounding territory, the authorities in Jerusalem, or merely those who were hostile to Jesus. (For further information see R. G. Bratcher, “ ‘The Jews’ in the Gospel of John,” 26 [1975]: 401–9.) Here the phrase refers to the Jewish authorities or leaders in Jerusalem. It was the Pharisees who had begun this line of questioning in John 8:13, and there has been no clear change since then in the identity of Jesus’ opponents.
48 The imperfect verb has been translated with ingressive force (“began to say”) because the comments that follow were occasioned by Jesus’ remarks in the preceding verse about his upcoming departure.

In other versions

So the Jews said, “Will he kill himself, since he says, ‘Where I am going, you cannot come’?”

This made the Jews ask, “Will he kill himself? Is that why he says, ‘Where I go, you cannot come’?”

So the Jews said again, “He won’t kill himself, will he, since he says, ‘Where I’m going, you cannot come’?”

The people asked, “Is he planning to commit suicide? What does he mean, ‘You cannot come where I am going’?”

Then the Jews began to say, “Perhaps he will kill himself, because he is saying, ‘Where I am going you cannot come.’ ”

Then said the Jews, Will he kill himself? because he saith, Whither I go, ye cannot come.

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