It is narrated from Hafsah (may Allah have mercy on her) that she stated: We entered ihram for Umrah in the blessed month of Ramadan, and then we reached Makkah in the month of Shawwal, while in those days there was a great crowd of people there. So we asked (about the legal nature of this act of worship of ours), and whomever we asked, he said that it is "Hajj al-Tamattu'".
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الحج / 1183
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :رجاله ثقات. » «أخرجه مصنف ابن أبي شيبة برقم: 14018»