Rasulullaah (SAW) said, “No person should pass the Miqaat without entering into Ihraam.”
[Ibn Abi Shaybah Vol.4 Pg.509]
There are few places at various distances from the Kabah where people are to enter into the state of Ihraam. Such a place is known as a Miqaat. It is compulsory for a person coming from outside Makkah to enter into Ihraam at these places.