Question 1: How do you know Allah by Allah? “Know Allah by Allah, and the Messenger by the Message, and the successor by the commanding of good, justice, and doing good to others…” AlKafi: Vol. 1, Page 85. Tawhid by Sheikh Sadooq: page 285–286
Answer: It means know Allah swt by Allah in the creation, who is Imam AlMahdi pbuh. He pbuh is the manifestation and appearance of Allah in the creation, meaning the manifestation and appearance of the City of Divine Perfections amongst the creation.
In other words, he is the manifestation and appearance of the names of Allah in the creation; because he, may the prayers of my Lord be upon him, is the face of Allah swt by which He faces His creation. Thus, whoever wants to know Allah swt must know Imam Al-Mahdi pbuh.
[This has been mentioned in the narrations of Ahlul Bayt pbut. It was narrated in Al-Ziyara AlJamia, “…Whoever desires Allah begins with you [Ahlul Bayt], and it is by you that Allah exposes liars, and it is by you that Allah pushes away the era of tyranny.” And Borayd Al-Ajali said that he heard Imam Al-Baqir pbuh saying, “Allah is worshipped through us, and known through us, and through us He is worshipped as One, and Muhammad is the veil of Allah swt.” Al-Kafi: Vol. 1, page 145.]
The Allegories – volume 1