Acts 25:21

But when Paul requested that his case be reviewed for a decision by Caesar, I ordered him to remain in custody until I could send him to Caesar."

Luke 2:1

Now it happened in those days that a decree was sent out from Caesar Augustus [the Emperor of the Roman Empire] requiring [people from] the whole empire to be registered [i.e., for taxation purposes].

Acts 25:10-11

Paul replied, "I am [already] standing before a court of Caesar's authority, where I deserve to be tried. I have done nothing wrong to the Jews, as you very well know.

Acts 26:32-1

Then Agrippa said to Festus, "This man could have been released if he had not appealed [his case] to Caesar."

2 Timothy 4:16

At my first defense [Note: Paul here refers to his initial hearing before the Roman court] no one supported me, but everyone deserted me. May it not be held against them.

Treasury of Scripture Knowledge

Summary

But when Paul had appealed to be reserved unto the hearing of Augustus, I commanded him to be kept till I might send him to Caesar.

Augustus

I commanded

Bible References

Had

Acts 25:10
Paul replied, "I am [already] standing before a court of Caesar's authority, where I deserve to be tried. I have done nothing wrong to the Jews, as you very well know.
Acts 26:32
Then Agrippa said to Festus, "This man could have been released if he had not appealed [his case] to Caesar."
2 Timothy 4:16
At my first defense [Note: Paul here refers to his initial hearing before the Roman court] no one supported me, but everyone deserted me. May it not be held against them.

Augustus

Acts 27:1
And when it was decided that we should sail for Italy, they transferred Paul and certain other prisoners to the custody of a military officer named Julius, of the Augustan battalion.
Luke 2:1
Now it happened in those days that a decree was sent out from Caesar Augustus [the Emperor of the Roman Empire] requiring [people from] the whole empire to be registered [i.e., for taxation purposes].

I commanded

Acts 25:12
After conferring with his advisors, Festus answered Paul, "[Since] you have appealed to Caesar, then you will go to Caesar."