Ezra 6:21, Separated themselves. This is traditionally believed to be the origin of the sect of the Pharisees. What started out as a noble step toward holiness and pleasing Elohim through righteous obedience to his commandments by Yeshua’s day had devolved into an exclusivistic religious cult comprised of a caste system based on human pride and traditions of men that had all but lost the concept of the true biblical concepts of holiness and righteousness. 

Having just suffered and endured the judgments of Elohim against the wicked rebelliousness of their forefathers, these Jews returning to land of Israel with Ezra the priest resolved to separate themselves from the pollutions of the world and devote themselves to living set-apart lives holy unto YHVH their Elohim.  Their starting point was noble and commendable and well-pleasing to Elohim, but several hundred years later they had so strayed from that original mission and spiritual course that now Yeshua the Messiah, Elohim in the flesh, was condemning them as the sons of the devil and the synagogue of Satan!

The same has been true, to one degree or another, of nearly all biblical based religious movements from that time until now including the modern Messianic or Hebrew Roots Movement. Many well intended individuals have started biblical truth restoration movements hoping to corrects the errors of past religious leaders, organizations and movements, but, in time, they too succumbed to the pendulum swings of whimsical and capricious human vicissitudes and have ended up in a ditch on the side of the road that Yeshua Messiah referred to as the straight and narrow path. 

What therefore must we do? Simply this: Get back to the basic apostolic message or the everlasting gospel (Rev 14:6) as described in the book of Revelation. The true end times saints are those who keep or guard the Torah-commandments of Elohim as revealed in the Tanakh (the Old Testament), while at the same time adhering to the faith or testimony of Yeshua as revealed in the Testimony of Yeshua (the New Testament) (Rev 12:17; 14:12).