There is No Tariqa Outside of the Shariah!
Sheikh Izz Ibn ‘Abd al-Salam’s book, al-Imam al-’Izz Ibn ‘Abd al-Salam wa atharuhu fi al-fiqh al-Islami, explains the importance of Sacred Law, Sharia for the Sufis:
The Sacred Law is the scale upon which men are weighed and profit is distinguished from loss. He who weighs heavily on the scales of the Sacred Law is of the friends (awliya) of Allah, among whom there is disparity of degree. And he who comes up short in the scales of the Sacred Law is of the people of ruin, among whom there is also disparity of degree. If one sees someone who can fly through the air, walk on water, or inform one of the unseen, but who contravenes the Sacred Law by committing an unlawful act without an extenuating circumstance that legally excuses it, or who neglects an obligatory act without lawful reason, one may know that such a person is a devil Allah has placed there as a temptation to the ignorant. Nor is it farfetched that such a person should be one of the means by which Allah chooses to lead men astray, for the Antichrist will bring the dead to life and make the living die, all as a temptation and affliction to those who would be misled.