1. Narrated by Imam Ali ar-Ridha (as)
Golden chain hadith
Narrated by Imam Ali ar-Ridha (as)

2. Golden chain hadith
Once when our 8th Imam, Imam Ali ar-Ridha (as) was travelling through a town called Nishapur, the people of the town asked Imam (as) to tell them a hadith from the Prophet (as).
Imam Ali ar-Ridha (A) told them the following hadith: "My father (Imam) Musa al-Kadhim (as) told me, from his father Ja'far as-Sadiq (as), from his father Muhammad al-Baqir (as), from his father Ali Zainul Abideen (as), from his father the martyr of Kerbala (Husain) (as), from his father Ali ibn Abu Talib (as), from the Holy Prophet (as). from Jibrail, from Allah: "The Kalima of La ilaha illallah is My fort, and whosoever says it will enter My fort, and whosoever enters My fort is safe from My punishment."

3. Golden chain hadith contd.
The people of Nishapur began reciting the Kalima.
Imam Ali ar-Ridha (as) continued:
“There is one condition to the safety of this fort and that is to obey and follow the Imams (as).”
This hadith is known as the golden chain hadith. This is because each member of the chain was a Ma'sum .
Moral: Just to say something will be of no use. Only when you understand what you are saying and believe in it enough to follow it then will it be of use to you.

4. Living Beings in other worlds
Imam Jafar Sadiq (as)
Reference: The Great Muslim Scientist and Philosopher,
Jafar As-Sadiq

5. Theory of ‘Aliens’
Another interesting theory of Imam Sadiq is that there are living beings in other worlds.
These beings by their advanced knowledge may be trying to contact us.
However, we do not know them and do not understand their language and we do not realise that they want to get in touch with us and talk to us.

6. Jinn
Imam said that the Quran has mentioned the names of Jinns, whom we cannot see.
It is also prophesied in the Quran that a day will come when humans and the unknown beings (whom we cannot see) will meet and live together.
No one before Imam Sadiq had said anything about the possibility of the presence of living beings in other worlds, who may be trying to contact us.

7. Efforts made (and being made) to prove this theory
It was only in late 19th century that Camille Flammarion of France raised this issue and presented his theory about the possibility of establishing contacts with unknown beings of other worlds.
However, he was unable to test this theory because science and technology had not advanced sufficiently.
In the year 1920, Marconi of Italy (who invented the radio) summoned a meeting of the officers of Italian Navy that in the wireless station of his ship, he received radio waves, which without a shadow of doubt were being sent to the people of the Earth by some intelligent and technologically advanced beings.
However, at that time telescopes were very weak and Marconi was unable to extend the horizon of his experiments.
Even today after the construction of strong telescopes we have not been able, so far, to establish any contact with unknown beings of other worlds, even though efforts are being made in this regard.
This is one of the theories of Imam Sadiq (as) which after 1400 years has still not been proved.