Mark 9:28-32

And when He had come into the house, His disciples asked Him privately, “Why could we not cast it out?” So He said to them, “This kind can come out by nothing but prayer and fasting.” Then they departed from there and passed through Galilee, and He did not want anyone to know it. For He taught His disciples and said to them, “The Son of Man is being betrayed into the hands of men, and they will kill Him. And after He is killed, He will rise the third day.” But they did not understand this saying, and were afraid to ask Him.