it is made lawful for you to have sexual relations with your wives on the night of assiyam . they are libas for you and you are libas for them. allah knows that you used to deceive yourselves so he turned to you and forgave you. so now have sexual relations with them and seek that which allah has ordained for you and eat and drink until the white thread of dawn appears to you distinct from the black thread then complete your fast till the nightfall. and do not have sexual relations with them while you are in i`tikaf in the masjids. these are the limits by allah so approach them not. thus does allah make clear his ayat to mankind that they may acquire taqwa.
أحل لكم ليلة الصيام الرفث إلى نسائكم هن لباس لكم وأنتم لباس لهن علم الله أنكم كنتم تختانون أنفسكم فتاب عليكم وعفا عنكم فالآن باشروهن وابتغوا ما كتب الله لكم وكلوا واشربوا حتى يتبين لكم الخيط الأبيض من الخيط الأسود من الفجر ثم أتموا الصيام إلى الليل ولا تباشروهن وأنتم عاكفون في المساجد تلك حدود الله فلا تقربوها كذلك يبين الله آياته للناس لعلهم يتقون