ولا يخرج المعتكف من المسجد إلا لحاجة الإنسان، أو الجمعة.
Translation: The person in retreat is not to leave the mosque except for bodily necessity or Friday prayer.
Ḥājat al-insān refers to essential bodily needs such as using the toilet. Al-jumuʿah permits leaving for Friday prayer when it cannot be performed at the place of retreat. Personal convenience is not automatically such an exemption.