It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever combines Hajj and Umrah (Qiran), one Tawaf is sufficient for both of them."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5350
Hadith Gradingحکم دارالسلام:صحيح موقوفا بهذا اللفظ .