Tahaarah for Tawaaf

Tahaarah is a condition for the validity of the Tawaaf according to the majority of scholars. 

They have used the following hadith as evidence

Ibn Taymiyyah and Ibn Uthaymiin hold the opinion that Tahaarah is not a condition for the validity of the Tawaaf. According to them if someone is performing the Tawaaf and passes wind, then he completes the Tawaaf and does not have to perform Wuduu.