Hadith of the two weighty things went to Zayd b.Arqam, one of the transmitters of the standard Ghadir Khumm. Zayd said to them that he has "forgotten some [of what he had heard from the prophet]" but he began to recite Hadith al-Thaqalayn for them as words that heard from prophet in The event of Ghadir Khumm. As the Allameh Tabataba'i said, some points can be driven from this hadith such as "the Holy Quran will remain until the day of Judgment, the progeny of the Mohammad prophet will remain". There will be any period of time that Shia Imam doesn't exist to guide Muslims. All
Hadith of Golden Chain Hadith Qudsi, i.e., the word of God, but differs from Quran. The Gabriel transmitted hadith from God to prophet. Al-Silsilah al-Dhahab is Mutawatir. Shia and sunni scholars have narrated the hadith by Different expressions with authenticity. This hadith is Musalsal meaning that it's a word of God and is conveyed from Prophet of Islam through Ahl al-Bayt to Ali al-Ridha. In other word, narrators of the hadith are Prophet and Ahl al-Bayt. According to shia view they are infallible and immune from error in practical matters, in inviting people to the religion and in perceiving the realm of cognition. because