Matthew 16:20 in the King James Version
Then charged he his disciples that they should tell no man that he was Jesus the Christ.
Context
19 I will give to you the keys of the Kingdom of Heaven, and whatever you bind on earth will have been bound in heaven; and whatever you release on earth will have been released in heaven.”
20 Then he commanded the disciples that they should tell no one that he was Jesus the Christ.
21 From that time, Jesus began to show his disciples that he must go to Jerusalem and suffer many things from the elders, chief priests, and scribes, and be killed, and the third day be raised up.