It is narrated from Ata (may Allah have mercy on him) that the Prophet (peace be upon him) said to Aisha (may Allah be pleased with her): "Your (one) Tawaf of the House of Allah and (one) Sa'i between Safa and Marwah are sufficient for your Hajj and Umrah."
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 975
Hadith Takhrijصحيح من غير هذا الطريق: أخرجه مسلم، الحج، باب بيان وجوه الاحرام وأنه يجوز افراد الحج والتمتع والقرآن... الخ (1211)۔