2 Now Judas, the one betraying Him, also knew the place, because Jesus often gathered there also with His disciples.
John 18:2 Cross References - CAB
Mark 11:11-12
Luke 21:37
37 And in the daytime He was teaching in the temple, but at night He went out and stayed on the mountain called Olivet.
Luke 22:39
39 And going out, He went to the Mount of Olives, according to His custom, and His disciples also followed Him.