Musannaf Ibn Abi Shaybah

Hazrat Ata, Hazrat Tawus, and Hazrat Mujahid state that there is no Umrah except for the Umrah which is begun from one’s home, 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 one returns to the Miqat and then performs Tamattu, I hope that he is considered as one who has performed Umrah (he will receive the reward of Umrah).