Awf Ibn Malik narrates that the Prophet (saws) said: "The Prophet (saw) said: “My Ummah will divide into a little above 70 sects, and its majority will be a fitnah over my Ummah. أعظمها فتنة على امتي There will be a group doing qiyas (guess work) in the matters with their personal opinions, and thereby making halal what is haram and making haram what is halal.”