First off, Yeshua was discussing a general principle.

Secondly, it applies to whatever context it applies to.  If they accept him in a limited away, such as accepting Torah but not the personal Messiah, then they may learn enough from Torah to avoid falling for the False Messiah.  I will deal with that in a separate post.

From: "Paul Wilson"
Sent: Monday, October 31, 2011 11:50:36 PM
Subject: Did Not Jesus Say

Some question if the Anti-Christ will be accepted by the Jews as their messiah even saying there is no scripture to prove they will and I say did not Jesus say in John 5:43 “I am come in my Father's name, and ye receive me not: if another shall come in his own name, him ye will receive.”. To me this is proof the Anti-Christ WILL be accepted as their messiah. I have a question in to a Jewish site & Jerry Golden about the messiah being a gentile and I will forward as soon as I get the answers.
 
Paul