Al-Harith bin Bilal narrates from his father, Sayyiduna Bilal bin al-Harith (may Allah be pleased with him), that he said: "O Messenger of Allah (peace and blessings be upon him), is the cancelling of Hajj (into Umrah) specific to us, or is it also for those who come after?" He (peace and blessings be upon him) said: "Rather, it is specific to us."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9004