17:12a

While I was with them: This clause refers to Jesus’ ministry on earth among his disciples. For example:

As long as I was with them (Phillips’ New Testament in Modern English)
-or-
During my time here (New Living Translation (2004))

17:12b

I protected…them: The Greek verb that the Berean Standard Bible translates as protected is the same as in 17:11d. This clause says that Jesus had kept his disciples safe. See the note there and translate this word as you did there to show the connection. For example:

I kept them safe (Good News Translation)
-or-
I kept them in your name (English Standard Version)

preserved them: The Greek word that the Berean Standard Bible translates as preserved in this context means the same as “protected” in 17:12b: “kept safe.” Repeating the idea emphasizes it. The same Greek word is also used in 12:25, where the Berean Standard Bible translates it as “keep.”

by Your name, the name You gave Me: The textual issue that was in 17:11e is also an issue here. Follow the same option here as you did there and translate this clause in the same or a similar way. For example:

in your name, the name you gave me
-or-
in the name that you gave me
-or-
in your name, ⌊the truth of who you are,⌋ that you have given me

17:12c

Not one of them has been lost: This clause indicates that Jesus kept all his disciples’ spiritual lives safe. None of them left or abandoned Christ, none of them stopped believing in God or in Christ. See 6:39 and the notes there. In some languages it may be natural to translate this clause as a positive statement. For example:

and only one of them, the one worthy of destruction, was lost (New Century Version)

has been lost: The Greek verb that the Berean Standard Bible translates as has been lost refers to suffering eternal, spiritual death. Spiritual death is when a person is separated from God forever and punished (often translated “perish” in 3:16). See how you translated this verb in 3:16, 10:28, and especially 12:25.

This Greek verb is more literally “perished.” Here are other ways to translate this verb:

perished (New American Standard Bible)
-or-
died eternally

except the son of destruction: This clause gives an exception to the previous clause. One of the disciples was lost, Judas Iscariot, who betrayed Jesus to his enemies.

the son of destruction: This expression that the Berean Standard Bible translates literally as the son of destruction is a figure of speech indicating that Judas had the character of one deserving destruction. Eternal destruction was suitable for his character and behavior and was its certain result. See 2 Thessalonians 2:3, which uses the same phrase. In your translation it is good to indicate that this man deserved the destruction/ruin that he would suffer. For example:

the one who had to be lost (Contemporary English Version)
-or-
the one who deserves destruction
-or-
the one who would certainly be lost/destroyed

17:12d

so that the Scripture would be fulfilled: This clause means “so it would happen just as the Old Testament prophecies said.” The reference here may be to Psalm 41:9, as in John 13:18. Here are other ways to translate this clause:

and this was to fulfil the scriptures (New Jerusalem Bible)
-or-
for scripture has to be fulfilled (Revised English Bible)
-or-
So Scripture came true. (God’s Word)

so that: The connector that the Berean Standard Bible has translated as so that here could introduce a purpose, but probably introduces a result. It is probably the result of Judas being lost (rather than the result of Jesus guarding his disciples).

Scripture: The Greek word that the Berean Standard Bible translates as Scripture means “what is written” and refers to the Old Testament as a whole. See how you translated this word in 7:38, 42.

would be fulfilled: This phrase means “would happen.” What the Old Testament foretold (predicted) really happened. In this context the word would does not imply any doubt that it would happen. For example:

would come true (Contemporary English Version)
-or-
came true (God’s Word)
-or-
as the Scriptures foretold (New Living Translation (2004))

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