In fasada hajjuhu, fasada is a past verb and hajjuhu its subject: the Hajj became invalid.
In lam yafsud hajjuhu, lam negates and makes the imperfect verb yafsud jussive: the Hajj was not invalidated.
For Umrah, la tafsudu ʿumratuhu also negates invalidity. The negative does not automatically negate the compensatory offering.
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Bab Jinayat al-Muhrim — Intimacy, Invalidity and Compensation (Part II)
In fasada hajjuhu, fasada is a past verb and hajjuhu its subject: the Hajj became invalid.
In lam yafsud hajjuhu, lam negates and makes the imperfect verb yafsud jussive: the Hajj was not invalidated.
For Umrah, la tafsudu ʿumratuhu also negates invalidity. The negative does not automatically negate the compensatory offering.