Adam Clarke on Acts 17:3

Opening and alleging - Παρατιθεμνος, Proving by citations. His method seems to have been this: 1st. He collected the scriptures that spoke of the Messiah. 2d. He applied these to Jesus Christ, showing that in him all these scriptures were fulfilled, and that he was the Savior of whom they were in expectation. He showed also that the Christ, or Messiah, must needs suffer - that this was predicted, and was an essential mark of the true Messiah. By proving this point, he corrected their false notion of a triumphant Messiah, and thus removed the scandal of the cross.