Ata (may Allah have mercy on him) says: I came with Ubayd bin Umayr to Sayyidah Aishah (may Allah be pleased with her) while she was in i'tikaf - or, another translation of 'mujawarah' is that she was living in the neighbourhood (of the Ka'bah). Ubayd said to her: O 'Hantah' (i.e., O lady)! I ask you about emigration. Sayyidah Aishah (may Allah be pleased with her) said: "There is no emigration after the conquest of Makkah." Emigration was only before the conquest of Makkah, when a man would emigrate for the sake of his religion to the Prophet (peace and blessings be upon him). Now that the conquest has taken place, a man can worship Allah wherever he wishes, and he will not be prevented from worship.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17776