Jamieson, Fausset and Brown on Acts 28:25-29

25-29. when they--the Jews.

agreed not among themselves--the discussion having passed into one between the two parties into which the visitors were now divided, respecting the arguments and conclusions of the apostle.

they departed--the material of discussion being felt by both parties to be exhausted.

after Paul had spoken one word--one solemn parting testimony, from those Scriptures regarded by both alike as "the Holy Ghost speaking" to Israel.