“Fa-in ṭibna lakum ʿan shayʾin minhu nafsan”
“If they willingly relinquish part of it to you.” (al-Nisāʾ 4:4, excerpt)
The context is a woman’s entitlement to the bridal gift and any voluntary relinquishment of some of it. The wording “ṭibna … nafsan” stresses wholehearted willingness. It may be explained through a verb meaning to waive or give up a right voluntarily.
The decisive qualification is real consent. Pressure, humiliation or coercion cannot simply be reclassified as free choice. The action’s outward occurrence does not prove the inward willingness required by the verse.
Ibdāl here does not replace a legal condition; it helps explain why the Qur’anic verb emphasizes consent.