Numbers 23:26

23:26 But Balaam replied to Balak, “Did I not tell you, ‘All that the Lord speaks, I must do’?”

Numbers 32:31

32:31 Then the Gadites and the Reubenites answered, “Your servants will do what the Lord has spoken.

Numbers 35:30

35:30 “Whoever kills any person, the murderer must be put to death by the testimony of witnesses; but one witness cannot testify against any person to cause him to be put to death.