YHVH knows who they are. It is for Yeshua to sort out soon. He knows every hair on their head. First comes the Antichrist and many will be deceived by him. It's important to stay true to Jesus and not be deceieved or take the mark.

Revelation 2:9
9 I know thy works, and tribulation, and poverty, (but thou art rich) and I know the blasphemy of them which say they are Jews, and are not, but are the synagogue of Satan.

Revelation 3:9
I will make those who are of the synagogue of Satan, who claim to be Jews though they are not, but are liars—I will make them come and fall down at your feet and acknowledge that I have loved you.