116. The Prophet (s.a.w.) said: “If any of you copulates with his wife, he must cover himself, for if he does not cover himself, the angels will become shy and leave, and Satan will be present, and so if a child is conceived from them, Satan has a share in him.”¹

117. Imām al-Ridā (a.s.) said: “Having intercourse after intercourse without a ritual bath in between will cause insanity in the child [conceived from it].”²

118. Imām al-Ridā (a.s.) said: “Do not have intercourse with women at the beginning of the night, whether in winter or summer, as the stomach and veins are full and it is not an appropriate act. There is also the fear of colic, coarse tremor, gout, renal calculus (stone), dribbling, hernia, poor eyesight and weak memory. So, if you intend to have intercourse, it must be at the end of the night, for it is healthier for the body and more hopeful for the child [being conceived], and it is better for the increase of intelligence of the child that is conceived between them.”³⁴

116.عنه صلی الله علیه وآله : إذا أتىٰ أحَدُكُم أهلَهُ فَليَستَتِر؛ فَإِنَّهُ إذا لَم يَستَتِر استَحيَتِ المَلائِكَةُ و خَرَجَت، و حَضَرَهُ الشَّيطانُ، فَإذا كانَ بَينَهُما وَلَدٌ كانَ الشَّيطانُ فيهِ شَريكٌ¹ .²

117.الإمام الرضا علیه السلام : الجِماعُ بَعدَ الجِماعِ مِن غَيرِ أن يَكونَ بَينَهُما غُسلٌ يُورِثُ لِلوَلَدِ الجُنونَ.³

118.عنه علیه السلام : لا تَقرَبِ النِّساءَ في أوَّلِ اللَّيلِ لا شِتاءً و لا صَيفاً، و ذلِكَ أنَّ المَعِدَةَ وَ العُروقَ تَكونُ مُمتَلِئَةً و هُوَ غَيرُ مَحمودٍ، يُتَخَوَّفُ مِنهُ القولَنجُ⁴ وَ الفالِجُ، و اللَّقوَةُ،⁵ و النِّقرِسُ،⁶ و الحَصاةُ، و التَّقطِيرُ، وَ الفَتقُ وَ ضَعفُ البَصَرِ و الدِّماغِ.
فَإِذا أُريدَ ذلِكَ فَليَكُن في آخِرِ اللَّيلِ؛ فَإِنَّهُ أصَحُّ لِلبَدَنِ، و أرجىٰ لِلوَلَدِ، وَ أذكىٰ لِلعَقلِ فِي الوَلَدِ الَّذي يُقضىٰ بَينهُما.⁷