What specific measurements of uncovered 'Mughallaza' or 'Mukhaffafa' (lighter impurity category) invalidate the prayer according to Abu Hanifa?
Chapter on the Description of Prayer
Al-Mughni
Book of Prayer
Primary text
Abu Hanifa stated that if the uncovered area of the 'Mughallaza' is the size of a dirham (coin), or if the uncovered area of the 'Mukhaffafa' is less than one-fourth of it, the prayer is not invalidated. If it exceeds these amounts, the prayer is invalidated.
Supporting text
The correct position is that since the Sharia has not provided a specific measure for this, the ruling must revert to custom ('urf), similar to the rulings concerning the excessive amount of actions, separation, or possession within prayer. Establishing a fixed measure without textual evidence is not permissible.