According to Osho, adab in Sufism is a living discipline of love, a tariqa learned with the visible Master as a metaphor for the invisible God. It is the graceful comportment that arises spontaneously from devotion, not imposed rules. Starting as reverent presence, it matures into constant remembrance that permeates all relations, until seeker and guide dissolve in God.
Adab is the natural grace that grows from loving a Master, teaching you how to be with God everywhere.