The daughter of Abu Tajra'ah (may Allah be pleased with her), one of the women of Banu Abd al-Dar, says: I went with some women of Quraysh into the house of the family of Abu Husayn. We were watching the Messenger of Allah (peace and blessings be upon him) while he was performing the sa'i between al-Safa and al-Marwah. I saw him performing the sa'i, and his lower garment was swirling because of how fast he was going, so much so that I was saying that I would now see his knees. And I heard him saying: "Perform the sa'i, for Allah has indeed prescribed the sa'i for you."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9366