Hadith Silsilat al-Dhahab
Hadith Silsilat al-Dhahab (Arabic: حديث سِلسِلَة الذَّهَب, the Golden Chain Hadith) is a qudsi hadith narrated by Imam al-Rida (a) on his way to Merv through Neyshabur, on the unity of God and one of its main conditions. Since all the narrators of this hadith are the infallible Imams (a), all the way to the Holy Prophet (s), who has narrated it from Jabra'il (Gabriel) from God, thus it has been called Silsilat al-Dhahab, which means Golden Chain. According to some reports as Imam al-Rida (a) was saying the hadith more than twenty thousand people were writing it.
Based on this hadith, the belief in Tawhid rescues the person from hell fire. However, Imam al-Rida (a) has introduced himself as a condition for this salvation. Shi'a scholars believe that by this condition, Imam al-Rida (a) has meant the belief in Imamate.