The pilgrims will start their journey towards the Valley of Mina - nearly five kilometres from this holiest Islamic place - soon after pre-dawn prayers.
Many pilgrims will start the journey to Mina late tonight itself to avoid the heavy rush of pilgrims in the morning.
Saudi authorities have made elaborate arrangements for the pilgrims in Mina, where thousands of tents have been set up to host the 'guests of Allah'.
According to officials here, nearly 1.5 million pilgrims had arrived from various countries till Sunday and many more are expected to join them from neighbouring countries today.
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They will be joined by the Saudi nationals also later in the day.
About 1.5 lakh Indians are among the hundreds of thousands of pilgrims who have converged in the Kingdom for the five-day Hajj.
The Saudi authorities have deployed 1,00,000 security personnel for ensuring the safety and well-being of pilgrims.
Members of an elite counterterrorism unit, traffic police and emergency civil defence personnel are among those deployed to help with crowd control and safety. They are supported by additional troops from the army and National Guard.
The Interior Ministry, which is responsible for security, has installed 5,000 CCTV cameras in this city and Medina. The feed from these cameras is monitored round-the-clock.
"We are active, we are awake," Interior Ministry spokesman Major General Mansour Al-Turki said, referring to the security forces' readiness to deal with any eventuality.
The show - attended by Crown Prince Muhammad Bin Nayef - was aimed at deterring any would-be troublemakers.
More than 3,000 Civil Defence personnel have been deployed in Mina to oversee the safety and security of the pilgrims against any emergency hazards.