Mukhtasar Bukhari

Narrated Ibn Abbas (may Allah be pleased with them) that when the Prophet (peace and blessings of Allah be upon him) returned from his Hajj, he said to Umm Sinan Ansariyyah: "What prevented you from performing Hajj?" She replied, "So-and-so" (referring to her husband) "had two camels for carrying water; he went for Hajj on one, and the other is used to irrigate our land." The Prophet (peace and blessings of Allah be upon him) said: "Well, then perform Umrah, for indeed performing Umrah in Ramadan is equivalent to performing Hajj with me."