Mutarrif bin Abdullah bin al-Shikhkhir (may Allah have mercy on him) said: Imran bin Husayn (may Allah be pleased with him) said to me: Shall I not tell you something that will benefit you? The Messenger of Allah (peace and blessings be upon him) combined Hajj and Umrah, and then he did not forbid it, nor was any Qur'an revealed forbidding it. And the angels used to greet me with salam; when I had myself cauterised they stopped, and when I gave up cauterisation they came back.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 8850