Judas knew where this place was, because Jesus met there often with his followers. Judas was the one who turned against Jesus.
The man said, “Lord, have mercy on my son. He has epilepsy and is suffering very much, because he often falls into the fire or into the water.
During the day, Jesus taught the people in the Temple, and at night he went out of the city and stayed on the Mount of Olives.
Jesus left the city and went to the Mount of Olives, as he often did, and his followers went with him.