16:9

in regard to sin, because they do not believe in Me: The Greek word that the Berean Standard Bible translates as because introduces the reason that the Holy Spirit would convict them of sin. The people of the world needed the Holy Spirit to convict them because they did not believe in Jesus Christ.

in regard to sin: It may be natural to begin a new sentence here and repeat the verb from 16:7:

He will convict them of sin because they do not believe in me.
-or-
He will show that they have sinned.

they: This word refers to people in general who do not believe in Jesus. For example:

because people don’t believe in me (God’s Word)

do not believe in Me: To believe in Jesus includes the idea of believing the facts about who Jesus was and what he did. But it also includes the idea of trusting Jesus instead of trusting oneself or someone else. Both ideas are very closely related. If someone believes the facts about Jesus, it should result in trusting him. See how you translated similar phrases in 1:12, 2:11, and 3:16. Here are other ways to translate this clause:

didn’t have faith in me (Contemporary English Version)
-or-
refuse to believe in me (New Jerusalem Bible)
-or-
do not trust in me

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