Sahih al-Bukhari 1782

Musaddad narrated to us: Yahya narrated to us, from Ibn Jurayj, from Ata, who said: I heard Ibn Abbas, may Allah be pleased with them both, tell us that the Messenger of Allah, peace and blessings be upon him, said to a woman from the Ansar—whom Ibn Abbas named, but I have forgotten her name: What prevented you from performing Hajj with us? She said: We had a water-carrying camel. Abu So-and-so—her husband—and his son rode it, leaving us a camel that we used to draw water. He said: When Ramadan comes, perform Umrah during it, for an Umrah in Ramadan is equivalent to Hajj. Or he said something similar.