What is the meaning of Ibn 'Umar's statement that "their affair is one"?

Question : The statement of Ibn 'Umar (may Allah be pleased with him and grant him satisfaction) that "their affair is one," O Shaykh, so which characteristic unites all the characteristics, or does some of them differ from the others?

Answer : This is like the saying of the Prophet (peace and blessings be upon him) that "'Umrah is included in Hajj." The meaning of "their affair is one" is that one does not contradict the other. So if you combine Hajj with 'Umrah, the 'Umrah does not appear; rather, you are combining Hajj and 'Umrah.