فَيَطُوفُ سَبْعَةَ أَشْوَاطٍ، يَبْتَدِئُ بِالصَّفَا، وَيَخْتِمُ بِالْمَرْوَةِ.
Translation: He completes seven traversals, beginning at Safa and finishing at Marwa.
The seven one-way traversals are distinct from seven circuits around the Kaaba during tawaf.
Sa’y starts at Safa and the seventh traversal finishes at Marwa. The count and starting point both matter.