Haroon al-Abbasi coerced Imam Moosa Kazim (a.s.) to describe the territorial limits of Fadak
Imam (a.s.) – If I define its limits you will never return it.
Haroon – By your grandfather (s.a.w.a.) you must define it.
Imam (a.s.) – As for the first limit it is Aden (Yemen).
Haroon’s face changed colour. Haroon asked Imam (a.s.) to continue.
Imam (a.s.) – The second limit is Samarqand (Uzbekistan). Haroon’s face turned even darker.
Imam (a.s.) – The third limit is Africa. Haroon’s face turned black.
He said – Continue.
Imam (a.s.) – The fourth limit is the sea coast along the peninsula and Armenia.
Haroon – There is nothing left for us.
Imam Moosa (a.s.) – I had already told you that if I define its limits you will never return it.
It was then that Haroon decided to kill Imam Moosa Kazim (a.s.).
(Manaaqib Aal-e-Abi Taalib (a.s.), vol. 4, p. 320)
Necessity of Imamate
Abu Burdah al-Aslami reports, “The Messenger of Allah (s.a.w.a.) called for water for ablution (wudhu) while Ali Ibn Abi Talib (a.s.) was with him. The Messenger of Allah (s.a.w.a.) took the hand of Ali (a.s.) after performing the ablution, pressed it against his chest and said, ‘You are the warner.’ Then, he (s.a.w.a.) pressed it against the chest of Ali (a.s.) and said, ‘And for every nation there is a guide.’ Thereafter, he (s.a.w.a.) said, ‘Surely, you are the minaret of the people, the standard of guidance and the chief of the villages. I bear witness upon this that this is the truth’.”
(Behaar al-Anwaar, vol. 23, p. 2)
Ahle Bait (a.s.) are the Imams of the Muslims and the Divine Proofs
Sulaiman Ibn A’mash reports that Imam Sadeq (a.s.) narrates from his father who reports from his father Imam Ali Ibn al-Husain (a.s.),
“We are the Imams of the Muslims, Allah’s proofs upon the worlds, leaders of the believers, chiefs of the pious ones and the masters of the believers. We are safety for the people of the earth like the stars are security for the inhabitants of the sky. We are the ones due to whom Allah withholds the sky from falling on the earth except through His permission. Due to us the earth is withheld from swallowing its inhabitants. Through us rains descend and through us mercy is spread and the blessings of the earth come out. Had there not been (an Imam) from us in the earth, it would have been destroyed.”
Then Imam (a.s.) continues,
“Since Allah has created Adam (a.s.), the earth is not devoid of a proof from Allah; regardless of him being apparent and known or hidden and concealed. It cannot be devoid of a proof from Allah till the Day of Judgment. Had this not been the case, Allah would not have been worshipped.”
Sulaiman says, “I asked al-Sadeq (a.s.), ‘How can the people benefit from an Imam who is hidden and concealed?”
He (a.s.) replied,
“Like they benefit from the sun when the clouds conceal it.”