Minority/Majority Scholarly Opinions And Ijma
So in essence, compulsory adherence to Ijma/majority opinions can’t be proved from any divine source. However the whole practice of the clergy trying to enforce rulings backed up by Ijma/majority opinions is perhaps just a result of heavy institutionalization of their particular school of thought whose philosophy/thought process remains unchallenged for the most part by scholars due to social/political reasons.