A.T. Robertson Commentary Matthew 24:26

"If therefore they shall say unto you, Behold, he is in the wilderness; go not forth: Behold, he is in the inner chambers; believe [it] not." — Matthew 24:26 (ASV)

In the wilderness (εν τη ερημω). Like Simon son of Gioras (Josephus, War, IV,9,5,& 7).

In the inner chambers (εν τοις ταμειοις). Like John of Giscala (Josephus, War, V,6,1). False Messiahs act the role of the Great Unseen and Unknown.