Albert Barnes Commentary Matthew 24:23

"Then if any man shall say unto you, Lo, here is the Christ, or, Here; believe [it] not." — Matthew 24:23 (ASV)

Lo, here is Christ. The Messiah. The Jews expected the Messiah to deliver them from Roman oppression.

In the time of these great calamities, they would anxiously look for him. Many would claim to be the Messiah.

Many would follow them. Many would rejoice to believe that he had come and would call on others, Christians among them, to follow them.

Believe it not. You have evidence that the Messiah has come, and you are not to be deceived by the plausible pretensions of others.