Then woe to those who write the Book

Then woe to those who write the Book with their own hands and then say, "This is from Allah," to purchase with it a little price! Woe to them for what their hands have written and woe to them for that they earn thereby. 

{AL Quran , Surah Al-Baqarah (2) , 79}

It was narrated that Abu Hurairah said:"The Messenger of Allah sallallahu alaihi wasallam said: 'Whoever is given a Fatwa (verdict) that has no basis, then his sin will be upon the one who issued that Fatwa.'"

{Sunan Ibn Majah : Vol. 1, Book 1, Hadith 53 Hasan}