Al-mukallafoon Bil-ahkaam (those Who Have Been Charged Or Made Responsible With The Rulings)
Those who are Mukallaf (charged) with the Ahkaam (of Islaam) are all of the people and for that reason it has been said in regards to the definition of the Hukm Ash-Shar’iy that it is: “The address of the legislator related to the actions of the ‘Ibaad” and the ‘Ibaad refers to the people whether they are Muslim or Kuffaar (disbelievers).
The Daleel for that is as follows:
1 – Allah (swt) says:
Say: O people (Mankind) verily, I am the Messenger of Allah to you all (Al-A’araaf 158)
And Allah Ta’Aalaa said:
And We have not sent you except comprehensively to mankind as a bringer of good tidings and a warner (Saba’ 28).
So the ‘Naas’ (people/mankind) as a whole have been addressed with the Deen of Islaam and it is a duty for the Muslims to convey Islaam to them in an eye-catching manner. This is just as the Messenger of Allah (saw) did when he sent messengers and letters to the well-known and prominent kings and rulers existing at his time inviting them to embrace Islaam and to submit to the Islamic State.