The Aqsaam (categories) Of The Waajib In Respect To The Consideration Of Their Evaluation Or Non-evaluation In Respect To Amount Or Quantity
1 – Waajib Muhaddad Al-Miqdaar (the obligation where its quantity or amount is defined):
This refers to the Shaari’ having specified a defined amount or quantity related to the undertaking of the Waajib like the Zakaat and the number of Raka’aat in the obligatory prayers. The responsibility of the Mukallaf is not freed in respect to this Waajib except by undertaking and performing it upon the form that the Shaari’ has defined and specified and by the quantity or amount that has been specified for it.
2 – Waajib Ghair Muhaddad Al-Miqdaar (the obligation the amount or quantity of which is not specified):
This refers to what the Shaari’ (Legislator) has not defined and specified its amount. This is like spending in the way of Allah or the obligatory Nafaqah (spending) upon the wife and the children. That is because the Shaari’ left the specification of its amount to what the spender is capable of and in accordance to what is customary amongst the people.