حكمه: يثبت المقتضى بالضرورة، فيتقدر بقدرها.
A presupposed element is established only by necessity and is therefore limited to what that necessity requires.
This is the principle of limiting implication to the necessary amount. One must not introduce several additional implications if the wording only requires a narrower supplement to be intelligible.
The textbook adds an illustration:
فلا يصح نية الثلاث في أنت طالق.
“Therefore, intending three divorces in ‘you are divorced’ is not valid.”
This statement appears within its discussion of iqtida; it must not be treated as a comprehensive legal determination for every divorce scenario.