(19) باب جَوَازِ جِمَاعِهِ امْرَأَتَهُ فِي قُبُلِهَا مِنْ قُدَّامِهَا وَمِنْ وَرَائِهَا مِنْ غَيْرِ تَعَرُّضٍ لِلدُّبُرِ
Jabir (Allah be pleased with him) declared that the Jews used to say:
When a man has intercourse with his wife through the vagina but being on her back. the child will have squint, so the verse came down:" Your wives are your tilth; go then unto your tilth as you may desire" (ii. 223)
Reference: Sahih Muslim 1435 a
In-book reference: Book 16, Hadith 138
USC-MSA web (English) reference(deprecated numbering scheme): Book 8, Hadith 3363