because He was teaching His disciples. He told them, "The Son of Man will be delivered into the hands of men. They will kill Him, and after three days He will rise."

Matthew 16:21
From that time on Jesus began to show His disciples that He must go to Jerusalem and suffer many things at the hands of the elders, chief priests, and scribes, and that He must be killed and on the third day be raised to life.

Matthew 27:63
"Sir," they said, "we remember that while He was alive that deceiver said, 'After three days I will rise again.'

Mark 8:31
Then He began to teach them that the Son of Man must suffer many things and be rejected by the elders, chief priests, and scribes, and that He must be killed and after three days rise again.

Mark 9:12
He replied, "Elijah does indeed come first, and he restores all things. Why then is it written that the Son of Man must suffer many things and be rejected?

Mark 10:34
who will mock Him and spit on Him and flog Him and kill Him. And after three days He will rise again."

For he taught his disciples, and said to them, The Son of man is delivered into the hands of men, and they shall kill him; and after that he is killed, he shall rise the third day.