Acts: Paul has returned to Jerusalem which ends his Third Missionary Journey. Paul, in accordance with what James and the elders in Jerusalem urged, submitted to the rite of purification, principally to give the Jews no reason to imprison nor kill him. Perhaps this rite will prepare Paul for the various judicial trials (as well as the physical) which Paul will face anon. The subtext here again is where the Law fits in this new paradigm of faith toward God.
Gospel: Mark 10:17-31
New Testament: Acts 21:15-26
Old Testament: 2 Samuel 14:21-33