Jabir b. 'Abdullah reported that Allaah's Prophet (sallAllaahu alayhi wa sallam) and his Companions did not observe Sa'i between al-Safa' and al-Marwa but only one Sa'i.
No. 2930
Ibn Juraij reported on the same authority a hadith like that, and said: But one Tawaf and that was the first Tawaf.