Ibn ‘Abbas (رضي الله عنه) said:

The first woman to wear a girdle was the mother of Isma'eel; she used her girdle to hide her tracks from Sarah... and he mentioned the hadeeth. Ibn 'Abbas said: May Allah have mercy on the mother of Isma'eel! Had she let Zamzam flow or had she not scooped from that water, Zamzam would have been a stream flowing on the surface of the earth. Ibn 'Abbas said: The Prophet (ﷺ) said: The mother of Isma'eel was sitting near the water and she enjoyed the company of people. They settled there and sent for their families, who came and settled with them. In his hadeeth he said. She came down from as-Safa and when she reached the valley, she lifted the hem of her garment then ran like one who is exhausted until she crossed the valley, then she came to al-Marwah. Then she stood on it and looked to see if she could see anyone, but she could not see anyone. And she did that seven times." Ibn ‘Abbas said: The Prophet (ﷺ) said: "That is why the people ran between them (the two hills).”