For His saying [‏تَعَالَى‏] : "So whoever makes Hajj to the House or performs Umrah, there is no blame upon him to walk between them" [‏الْبَقَرَةِ‏:‏ 158‏] .

And the evidence that His saying: "there is no blame upon him to walk between them" is not in meaning like His saying: "there is no blame upon you to shorten the prayer" [‏النِّسَاءِ‏:‏ 101‏] .

Hazrat Habibah bint Abu Tujrah narrates that in the days of ignorance, we had a window (which opened towards Safa and Marwah). She says that I looked through the ventilator between Safa and Marwah, and my eyes fell upon the Prophet Muhammad (peace be upon him) while he was running, and he was saying to his noble companions: "Run, for Allah Almighty has made running (at this place) obligatory upon you." Indeed, I saw that due to the speed, his lower garment was turning around his blessed stomach, until I saw the whiteness of his stomach and thigh.