A couple of Authentic narrations elaborating on the knowledge of languages of the Imams (as):

“Abu ‘Abd Allah (as) has said, ‘Al-Hassan (as) has said, “Allah has two cities. One is in the east and the other is in the west. They have a boundary around them that is made of iron and each one has a million doors. Seven thousand different languages exist therein and I know all those languages and all that is in and between the two cities. No one possesses Leadership with Divine Authority over them except me and my brother al-Husayn (as).’”

Sanad: Ahmad ibn Muhammad and Muhammad ibn Yahya have narrated from Muhammad ibn al-Hassan from Ya‘qub ibn Yazid from ibn abu ‘Umayr from his people from abu ‘Abd Allah, recipient of divine supreme covenant, who has said the above hadith

Source: Usool al-Kafi, Volume 1, Chapter 172, Hadith #5 (See First Image below)

Grading: Allaamah al-Majlisi graded this hadith Authentic/Sahih (صحيح) [Mira’at al-Uqool, Volume 5, Page 357 (See Second Image below)]

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“Al-Reza (as) spoke with people in their own languages. By God, he was the most eloquent and the most knowledgeable person in any language. One day I told him, ‘O son of the Prophet of God! I am amazed at your mastery over all these various languages.’ Al-Reza (as) said, ‘O Aba Salt! I am the Proof of God for His creatures. God would not designate a Proof for Himself to any nation who does not know their language. Have you not heard that Ali – the Commander of the Faithful (as) said?, ‘We have been granted elaborate speech.’ Then how can this be without mastery of all the languages?’”

Sanad: Ahmad ibn Ziyad al-Hamadani narrated that Ali ibn Ibrahim ibn Hashem, on the authority of Aba Salt al-Harawi who said the above hadith

Source: `Uyoun Akhbaar al-Ridha, Sh. al-Sadooq, Volume 2, Chapter 54, Hadith #3 (See First Image below)

Grading: All the narrators in the chain are Thiqa (Reliable), therefore the hadith is Sahih (Authentic) – Taken from al-Jawhary’s al-Mufeed (See Second Image below):
– Ahmad ibn Ziyad al-Hamadani (Thiqa, 583)
– Ali ibn Ibrahim ibn Hashem (Thiqa, 7830)
– Aba Salt al-Harawi (Abdul al-Salam bin Saleh) (Thiqa, 6515)

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