Sahih Muslim Book - 16, Hadith - 3535

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ وَأَبُو بَكْرِ بْنُ أَبِى شَيْبَةَ وَعَمْرٌو النَّاقِدُ - وَاللَّفْظُ لأَبِى بَكْرٍ - قَالُوا حَدَّثَنَا سُفْيَانُ عَنِ ابْنِ الْمُنْكَدِرِ سَمِعَ جَابرًا يَقُولُ كَانَتِ الْيَهُودُ تَقُولُ إِذَا أَتَى الرَّجُلُ امْرَأَتَهُ مِنْ دُبُرِهَا فِى قُبُلِهَا كَانَ الْوَلَدُ أَحْوَلَ فَنَزَلَتْ ( نِسَاؤُكُمْ حَرْثٌ لَكُمْ فَأْتُوا حَرْثَكُمْ أَنَّى شِئْتُمْ)

Jabir said: "The Jews used to say that if a man had intercourse with a woman from the back, in the vagina, the child would have a squint. Then the following was revealed: 'Your wives are a tilth for you, so go to your tilth, when or how you will ..."'