In Hanafi terminology, fard and wajib are distinct categories. Tawaf al-Ziyarah is fard, while the cited passage calls Tawaf al-Sadr wajib.
Omitting a wajib is not inconsequential; its remedies are treated under separate pilgrimage-law rules. But saying that an omitted farewell tawaf automatically nullifies the entire Hajj would erase the explicit legal distinction.
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Book of Hajj: Farewell Tawaf, Muhassab and Departure from Makkah
In Hanafi terminology, fard and wajib are distinct categories. Tawaf al-Ziyarah is fard, while the cited passage calls Tawaf al-Sadr wajib.
Omitting a wajib is not inconsequential; its remedies are treated under separate pilgrimage-law rules. But saying that an omitted farewell tawaf automatically nullifies the entire Hajj would erase the explicit legal distinction.