Narrated Jabir:
"The Jews would say: "Whoever goes into his wife's vagina from behind her, then his children will be cross-eyed.' So Allah revealed:
Your wives are a tilth for your, so go to your tilth when or how you will (2:223)."
حَدَّثَنَا ابْنُ أَبِي عُمَرَ، حَدَّثَنَا سُفْيَانُ، عَنِ ابْنِ الْمُنْكَدِرِ، سَمِعَ جَابِرًا، يَقُولُ كَانَتِ الْيَهُودُ تَقُولُ مَنْ أَتَى امْرَأَتَهُ فِي قُبُلِهَا مِنْ دُبُرِهَا كَانَ الْوَلَدُ أَحْوَلَ فَنَزَلَتْ : (نِسَاؤُكُمْ حَرْثٌ لَكُمْ فَأْتُوا حَرْثَكُمْ أَنَّى شِئْتُمْ ) . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ
حَسَنٌ صَحِيحٌ .
Grade : Sahih (Darussalam)
English reference : Vol. 5, Book 44, Hadith 2978
Arabic reference : Book 47, Hadith 3245
http://sunnah.com/urn/639710