In the narration of Sayyidah Aisha (may Allah be pleased with her), it is mentioned that Sayyidah Aisha (may Allah be pleased with her) sought permission from the Prophet (peace be upon him) to perform i'tikaf with him, so the Prophet (peace be upon him) granted her permission. Then she also sought permission from him for Sayyidah Hafsa (may Allah be pleased with her). I have already written this complete hadith.