"'Umar came to the Messenger of Allah ﷺ and said: 'O Messenger of Allah! I am ruined!' He said: 'Why are you ruined?' He said: 'I turned my mount during the night (meaning that he went into his wife from behind).'" He said: "So the Messenger of Allah ﷺ did not say anything in reply to him. Then Allah revealed this Ayah to the Messenger of Allah ﷺ: 'Your wives are a tilth for you, so go to your tilth when or how you will (2:223).' From the front, the back, avoiding the anus, and menstruation." (Using translation from Tirmidhī 2980)
جَاءَ عُمَرُ بْنُ الْخَطَّابِ إِلَى رَسُولِ اللهِ ﷺ فَقَالَ يَا رَسُولَ اللهِ هَلَكْتُ قَالَ «وَمَا الَّذِي أَهْلَكَكَ؟» قَالَ حَوَّلْتُ رَحْلِي اللَّيْلَةَ فَلَمْ يَرُدَّ عَلَيْهِ شَيْئًا فَأُوحِيَ إِلَى رَسُولِ اللهِ ﷺ هَذِهِ الْآيَةُ {نِسَاؤُكُمْ حَرْثٌ لَكُمْ فَأْتُوا حَرْثَكُمْ أَنَّى شِئْتُمْ} [البقرة 223] يَقُولُ «أَقْبِلْ وَأَدْبِرْ وَاتَّقِ الدُّبُرَ وَالْحَيْضَةَ»