The Hajj sermon was delivered at Mount Arafat on Monday, where more than two million Muslims from around the world gathered to perform the pinnacle of the pilgrimage. 

Almost 2 million of worshippers scaled the rocky hill southeast of the holy city of Makkah for a day of prayers and reflection where Prophet Mohammed (PBUH) delivered his final sermon.

The imam of Prophet's (PBUH) Mosque, Sheikh Hussein bin Abdelaziz Al al-Sheikh, delivered the sermon. 

The pilgrims will perform Zuhr and Asr prayers combined, and spend time in Arafat with prayers for acceptance of their pilgrimage and recitation of Quranic verses until sunset.

After sunset, the pilgrims will head to Muzdalifah, where they will stay until midnight, engaged in prayers after performing Maghreb and Isha prayers combined.

The ritual of changing Ghilaf-e-Kaaba was also held early Monday morning.

The new Ghilaf was prepared at a cost of 200,000 Riyal. It comprises 670kg pure silk, 120kg gold and 100kg silver.

Imam Masjid-ul-Haram Dr Abd ur Rahman Assudais and Governor Makkah Khalid Faisal participated in the ritual.

Tens of thousands of security personnel have been deployed for the pilgrimage. 

This year, the Saudis have launched a "smart Hajj" initiative, with apps to help pilgrims with everything from travel plans to medical care.