Sahl ibn 'Abdallah at-Tustari (d. 173H.) was one of the Salaf quoted widely by 'ulema of all the schools. He kept company with Dhu'n-Nun al-Misri who had taken the Muwatta directly from Imam Malik.

Al-Qurtubi in his renowned Tafsir quotes him, in his commentary on the ayat:
"... obey Allah and obey the Messenger and those in command among you..."
as ordering:
"Obey the Sultan with respect to seven things: the minting of the dinar and the dirham, fixing weights and measures, legal judgements, Hajj, Jumu'ah, the two Eids and Jihad."

 

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The Return of the Gold Dinar