Musannaf Ibn Abi Shaybah

Hazrat Ata, Hazrat Tawus, and Hazrat Mujahid state that apart from this Umrah, there is no other Umrah which the Prophet began from these Miqats, and after the fourth day of the days of sacrifice (Ayam al-Nahr), there is no Umrah. And Hazrat Saeed bin Jubair states that if he goes towards the Miqat and enters into Ihram from there and then comes (to perform Umrah), then he may perform Umrah; I hope that by doing so, he will receive the reward of Umrah.