What is the penalty if a person engages in sexual relations (wuq'u) before shortening the hair during Umrah?

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If sexual relations occur before shortening the hair, a sacrificial animal (dam) is due, but the Umrah remains valid. This is the position held by Malik and the Hanafi school (Ashab al-Ra'y). The basis for this ruling is the narration from Ibn Abbas concerning a woman whose husband had relations with her before she shortened her hair; he stated that whoever omits or forgets a rite must offer a blood sacrifice (dam), and if wealthy, slaughter a she-camel. This ruling is supported by the reasoning that since shortening is not a pillar (rukn), its omission or engaging in prohibited acts before it does not invalidate the ritual, analogous to the omission of stoning (rami) in Hajj.