What does Acts 21:11 mean?
Paul and his companions are only a few days from Jerusalem. They have sailed from Troas, on the northeast coast of the Aegean Sea, to Caesarea Maritima; from here, they walk. Before they leave, however, the prophet Agabus arrives with a warning.Paul knows he will be arrested when he reaches Jerusalem; the Holy Spirit has been preparing him for months (Acts 20:22–24). In addition, the Holy Spirit told prophets in Tyre as well as Philip's four daughters (Acts 21:3–4, 9). Agabus' prophesy is a bit more dramatic, and very specific. It's also metaphorical. When the mob attacks Paul, they drag him out of the temple and beat him. The Roman tribune must take Paul from the crowd and then orders his hands be bound in two chains (Acts 21:30–33). There's no indication the Jews tie Paul with a belt—although they may have—or voluntarily hand him over to the guards. They "deliver" Paul in that they create a situation which ends with him in Roman custody. That doesn't mean the prophecy is false; the point was that Paul would be arrested, not that some specific material would bind his hands.
Agabus is from a long list of great performance-artist prophets. Isaiah had to walk around without most of his clothes (Isaiah 20:2). Jeremiah had to walk all the way to the Euphrates River to bury a loincloth (Jeremiah 13:1–7). Ezekiel had to make a diorama of Jerusalem, lie on one side for 390 days and the other for 40 days, and pretend to escape out of a hole in the wall of his house (Ezekiel 4:1–8; 12:3–7).
As in Tyre, when the church fully understands what Paul will face, they try to convince him to stay. Paul refuses. He says, "What are you doing, weeping and breaking my heart? For I am ready not only to be imprisoned but even to die in Jerusalem for the name of the Lord Jesus" (Acts 21:13). He understands the Holy Spirit warns him so that he may prepare for what is coming, not escape it.