Tafsiran Kejadian 9:6: Rashi, Chizkuni, Sforno & Radak

באדם דמו ישפך BY MAN SHALL HIS BLOOD BE SHED — If there are witnesses you kill him. Why? Because in the image of God [made He man] and he has destroyed the Divine image (Genesis Rabbah 34:14)

באדם דמו ישפך, “his blood will be spilled by a fellow human being.” Here the Torah revealed the penalty for murder. Where had it issued the warning not to commit murder? This is found in Exodus 20,13: לא תרצח, “do not commit murder!”

באדם דמו ישפך, a reference to a human tribunal.

עשה את האדם HE MADE MAN — This verse is abbreviated and should be “the Maker made man”; there are many similar expressions in the Scriptures.