It is narrated from Khuzaimah bin Thabit (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Allah Almighty does not shy away from stating the truth, therefore do not approach women from their "back passage."
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 21874
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد ضعيف الاضطرابه