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)۔
Sometimes Sufyan (may Allah have mercy on him) narrated from Ata (may Allah have mercy on him) without the intermediary of Ibn Abi Najih (may Allah have mercy on him), and he (Ata) narrates from Aisha (may Allah be pleased with her).
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 977
Hadith Takhrijصحيح أخرجه أبو داود، المناسك، باب طواف القارن (1897)۔