It is narrated from Zaid bin Thabit (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever is given something as 'Umra, it is for him."
Hadith Referenceمسند الإمام الشافعي / كتاب الوقف والعمرى والرقبى / 1069