What are the sources of sufism?

Sufism or Tasawwuf is a vast subject that can have differering meanings to different people.

Sufism in it's pure form is against what many people consider sufism today ie. twirling, dancing etc.

Pure Tasawwuf or sufism has it's sources from the Quran, Hadeeth and the verdict's and explainaitions of learned scholars or jurist.