The previous verse implied that the Jew, Christians, and Arab Polytheists, who disputed with the prophet were not yielded to the right and truth, and this verse (NO. 21) alludes to three heinous sins of theirs; namely the rejection of faith - slaying the prophets, and killing those people who enjoined justice. ***** (Killing the prophets may allude to ZACHARIAS whom they slew between the temple and altar (matt. 23: 35) And also JOHN THE BAPTIST whom they put to jail, then beheaded him and at last his head was presented to a dancing harlot - (MATT 14: 1 -11) They also proceeded to kill Jesus Chirst on the cross, but they failed, and God raised him alive, though some of the Christians still think that Jesus died on the cross to atone for their SINS!) TRANSLATOR'S NOTE