Mark 9:9-10, 31-32

And as they were coming down from the mountain, he charged them that they should tell no man what things they had seen, save when the Son of man should have risen again from the dead. And they kept the saying, questioning among themselves what the rising again from the dead should mean.

For he taught his disciples, and said unto them, The Son of man is delivered up into the hands of men, and they shall kill him; and when he is killed, after three days he shall rise again. But they understood not the saying, and were afraid to ask him.