Taking Tabarruk from the Awliya and Buzurgs

Q: A sheikh of tasawwuf told his murid, who was going for four months to read salaah at a certain spot in Nizamuddeen markaz where Ml Ilyaas (Rahmatullahi Alayh) used to read tahajjud salaah, is this not bidat? Is such a action established in deen? If there is such a thing as taking barkat, will it not be restricted to Nabi (Sallallahu Alayhi Wasallam)? Please answer in detail with relevant proofs from Quraan and Hadith.

Hajj with Haraam money

Q: Is a hajj that is performed by someone who's money is 100% haraam from selling drugs accepted, the person is a drug dealer. When the person is on Arafat is all his sins also forgiven when returning as a Hajji. Please give a detial explanation & what is the punishment.