Tariq bin Shihab narrated: I asked Sayyiduna Abdullah (may Allah be pleased with him) about a woman who wanted to combine Umrah with her Hajj. He said: "Have you not heard Allah's saying: 'The Hajj is (in) well-known months' [Surah al-Baqarah: 197]? I regard these (months) as nothing but the months of Hajj."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9668