Command them to speak

1. Deut. 18: 20
     20 But the prophet, which shall presume to speak a word in my name, which I have not commanded him to speak, or that shall speak in the name of other gods, even that prophet shall die.
2. Josh. 4: 10
     10 ¶ For the priests which bare the ark stood in the midst of Jordan, until every thing was finished that the Lord commanded Joshua to speak unto the people, according to all that Moses commanded Joshua: and the people hasted and passed over.
3. Jer. 26: 2, 8
     2 Thus saith the Lord; Stand in the court of the Lord’s house, and speak unto all the cities of Judah, which come to worship in the Lord’s house, all the words that I command thee to speak unto them; diminish not a word:
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     8 ¶ Now it came to pass, when Jeremiah had made an end of speaking all that the Lord had commanded him to speak unto all the people, that the priests and the prophets and all the people took him, saying, Thou shalt surely die.
4. Alma 14: 19
     19 And it came to pass that the judge stood before them, and said: Why do ye not answer the words of this people? Know ye not that I have power to deliver you up unto the flames? And he commanded them to speak; but they answered nothing.