This hadith being known as the hadith of thaqalain, is one of the narrations, which are employed by the Shia to support their doctrine. However, this account occurs in the Sunnite canonical books of hadith. In this article, we examined its authenticity as well as the meaning of this hadith. In addition, we evaluated what is the loyalty to the Ahl albayt of the Prophet along with the Qur'an. Narrations of Thaqalain hadith narrate to us two different traditions of the Prophet (Peace be upon Him). He said that "O People! I am leaving a thing among you that if you hold on to, you never go astray; the book of Allah" during his pilgrimage at Arafat Hill. In some narrations, and he added that "and my sunnah". He said that "I have left two precious thing (thaqalain) among you. One of which is greater than the other. The book of Allah and my Ahl al-Bayt. So watch out how you treat them after me", during the course of his return journey from Mecca to Madinah at Ghadir Khumm. In other words, he asked people to know their honor and rights and to respect them. Nevertheless, in some narrations, "they will never separate until they return to me by the side of the Pool (the Kawsar)" is a fabricated narration.