A person forgetfully wore an 'abaya (robe) before having had his head shaved and after throwing Jamrat al-'Aqabah al-Kubra. He then had his head shaved and made tawaf al-ifada followed by sa'y and full release from ihram. What must he to do?

It is established in the Shafi'i school of jurisprudence that it is not obligatory for a pilgrim to make a fidya (compensation) for committing out of forgetfulness or ignorance any of the prohibitions of ihram that are prohibited for reasons of self-indulgence. These include using perfume, engaging in sexual intercourse, wearing sewn garments and covering the face or head. The fidya is only obligatory upon a pilgrim who knowingly and deliberately does any of the above.

Based on the above, if a pilgrim in a state of ihram wears an 'abaya after stoning Jamarat al-'Aqaba out of forgetfulness or ignorance, he is not blameworthy; his hajj is valid and he is not obliged to slaughter in compensation.