Acts 16:18

18 She kept this up for many days. Finally Paul became so annoyed that he turned around and said to the spirit, “In the name of Jesus Christ I command you to come out of her!” At that moment the spirit left her.

Read Acts 16:18 Using Other Translations

And this did she many days. But Paul, being grieved, turned and said to the spirit, I command thee in the name of Jesus Christ to come out of her. And he came out the same hour.
And this she kept doing for many days. Paul, having become greatly annoyed, turned and said to the spirit, "I command you in the name of Jesus Christ to come out of her." And it came out that very hour.
This went on day after day until Paul got so exasperated that he turned and said to the demon within her, “I command you in the name of Jesus Christ to come out of her.” And instantly it left her.

What does Acts 16:18 mean?

John Gill's Exposition of the Bible
Acts 16:18

And this she did many days
As the apostle and his company passed to and from the oratory, being for that time at Lydia's house; she followed them, and repeated the above words. This she was suffered to do, time after time; not that the apostle and his friends wanted such a testimony, or that it was of any use to them; but that the expulsion of the evil spirit might be more manliest, and more taken notice of: but Paul being grieved;
at the unhappy condition the maid was in, being possessed with such a spirit: and that the people were so imposed upon and deluded by it; and that it should be thought that there was any combination and agreement between that and him: turned;
himself to her, who was behind him, she following him, as is said in the preceding verse; this is left out in the Syriac version: and said to the spirit;
or to that spirit, as the same version renders it; to the spirit of Python, or Apollo, or of divination, that was in the maid; the Ethiopic version reads, "and he said", "in", or "by the Holy Spirit"; being under a more than ordinary influence and impulse of his; but not the spirit by which he spake, but the spirit to which he spake, is here meant: I command thee in the name of Jesus Christ to come out of her, and
he came out the same hour;
this is an instance of that power which Christ gave to his apostles to cast out devils in his name, ( Matthew 10:1 ) ( Mark 16:17 )

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