Jabir b. 'Abdullah reported that Allah's Apostle (ﷺ) and his Companions did not observe Sa'i between al-Safa' and al-Marwa but only one Sa'i.
Sahih Muslim Book 15, Hadith 291
← Previous Hadith " Verily al-Safa' and al-Marwa are among the Signs of Allah" ; so whoever performs Hajj or 'Umra, for him there is no harm that he should circumambulate between them.

Sahih Muslim Book 15, Hadith 290 Next Hadith → But one Tawaf and that was the first Tawaf.

Sahih Muslim Book 15, Hadith 292