Sayyiduna Ibn Umar (may Allah be pleased with him) narrates that it is obligatory upon every person to perform one Hajj and one Umrah; it is necessary to fulfill both of them. Then, whoever performs more Hajj or Umrah, this is a matter of great goodness, blessing, and virtue.
Hadith Referenceصحيح ابن خزيمه / جماع أبواب ذكر العمرة وشرائعها وسننها وفضائلها / 3066