O You who have believed! Fulfil the contracts (Al-Maa’idah 1).
Third Pillar From The Pillars Of The Hukm - Al-mahkoom Feehi
Al-Mahkoom Feehi: It is what the Talab Ash-Shaari’ (request of the Legislator) is attached or related to.
That is in the case where the Khitaab Ash-Shaari’ is attached to the action of the Mukallaf and to what is connected to that action in terms of a thing, a Sabab, Shart, or Sihhah, Butlaan and Fasaad, or Rukhsah and ‘Azeemah. In other words, the Mahkoom Feehi is that which is related to the Khitaab Ash-Shaari’ in terms of At-Takleef and in terms of Al-Wad’u.
So for example:
The Wujoob (obligation) deduced from this address is attached to the action of the Mukallafeen. It is: The fulfilment of the contracts and as such the address, has made this action Waajib (obligatory).
And in respect to the Qawl of Allah Ta’Aalaa:
O you who have believed, when you contract a debt for a specified term, write it down (Al-Baqarah 282).
The Nadb (recommendation) deduced from this address relates to an act from amongst the acts of the Mukallafeen which is the writing down (recording) of the debt. The address, as such, made this action Mandoob.