Professor Hussein Ansarian referred to Hadith of Thagalain (Hadith of the two weighty things) in Sunni books and noted: “I have left with you something, which if you strictly adhere to, you shall never go astray–The Book of Allah and my progeny.” Ahlulbayt (A.S) and the Holy Quran are separated until the day of judgment. If you adhere to both in your life, none of you will go astray until the day of judgement. If you only go after the Holy Quran, you have gone astray, if you only go after the narrations, again you have gone astray.
source : erfan.ir