Prophecy

309. To heed the call of every prophet in each generation, provided that he neither adds to, nor takes away from the Torah  Affirmative
  Deuteronomy 18:15  
310. Not to prophesy falsely Negative
  Deuteronomy 18:20  
311. Not to refrain from putting a false prophet to death nor to be in fear of him  Negative
  Deuteronomy 18:22