Imam Raza reportedly said a famous Ahadith here which is known as Silsilat al-Dhahab
"The Kalima of 'La ilaha illallah' is My fort, and whosoever says it will enter My fort, whosoever enters My fort is safe from My punishment."
This hadith is known as the Golden chain hadith. This is because each member of the chain was a Masoom (infallible). The people of Nishapur began reciting the Kalima and thought that His Holiness talk was over, but to their amazement the Holy Imam Raza (as) added the following words to what he had previously stated:
"But all this depends on some conditions, and I am considered to be one of those conditions".
This historical and the most famous Hadith Qudsi is called "Silsilat al-Dhahab". Imam Raza (as) confirms that worshipping God will be counted as a perfect procedure when it is based on the obedience of the immaculate Holy Imams (as). This historical statement of Imam Raza (as) implied the presentation and assertion of the Imamat (socio-religious leadership) of His Holiness.