Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Bukhari :: Book 5 :: Volume 59 :: Hadith 497
Abdullah bin Umar set out for Umra during the period of afflictions, and he said, "If I should be stopped from visiting the Kaba, I will do what we did when we were with Allah's Apostle." He assumed Ihram for 'Umra in the year of Al-Hudaibiya.
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