16:18a

She continued this for many days: This indicates that the girl continued shouting the saying in 16:17 whenever Paul and the others went to the river to worship. For example:

She did this for many days (Good News Translation)

16:18b

Eventually Paul grew so aggravated: Paul was disturbed that the evil spirit made the girl say those things. The message was misleading (see second note on 16:17b). He was probably also unhappy about the girl being controlled by an evil spirit. Other ways to translate this clause are:

Paul became very disturbed ⌊by this misleading message⌋
-or-
Paul became so upset (Good News Translation)
-or-
This bothered Paul (New Century Version)

he turned and said to the spirit: Paul turned toward the girl and spoke to her, but his words were for the evil spirit. Your translation should not indicate that he saw the spirit. For example:

turned round and spoke to the spirit in her (Phillips’ New Testament in Modern English)

the spirit: This is the same spirit as in 16:16.

16:18c

In the name of Jesus Christ I command you to come out of her: The phrase In the name of Jesus Christ indicates that Jesus Christ had authorized Paul to command evil spirits to leave. For example:

By the power of Jesus Christ, I command you to come out of her! (New Century Version)
-or-
By the authority that Jesus Christ gave to me, I command you to leave her!
-or-
Jesus Christ has authorized me to command you to leave her!

This phrase is not a magic formula. Your translation should clearly refer to the authority of Jesus Christ.

Christ: The word Christ is a title for Jesus. It means “the anointed one.” The Jews used it to refer to the special person God promised to send. See how you translated this word in 15:26.

16:18d

at that very moment: This phrase in Greek is literally “in the same hour.” It is a Greek idiom for “immediately.” For example:

instantly (New Living Translation (2004))

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