"I head Ibn Umar say - When we asked him about a man who came for Umrah, and perfomed Tawaf around the House, but did not perform Sai betwwen As-Safa and al-Marwah, could he be intimate with his wife? He said: 'When the Messenger of Allah came, he circumambulated seven times, and prayed two Rakahs behind the Maqam, and performed Sai between As-Safa and Al-Marwah. And you have the best examples in the Messenger of Allah.'" (Sahih) Chpater 143. What Should A Person Do If He Enters Ihram For Hajj and Umrah But he Has Not Brought A Hadi (Using translation from Nasāʾī 2930)  

عَنْ رَجُلٍ قَدِمَ مُعْتَمِرًا فَطَافَ بِالْبَيْتِ وَلَمْ يَطُفْ بَيْنَ الصَّفَا وَالْمَرْوَةِ أَيَأْتِي أَهْلَهُ؟ فَقَالَ لَنَا «قَدِمَ رَسُولُ اللهِ ﷺ فَطَافَ بِالْبَيْتِ أُسْبُوعًا وَصَلَّى خَلْفَ الْمَقَامِ رَكْعَتَيْنِ وَطَافَ بَيْنَ الصَّفَا وَالْمَرْوَةِ وَقَدْ كَانَ لَكُمْ فِي رَسُولِ اللهِ أُسْوَةٌ حَسَنَةٌ»