Abu Tamimah al-Hujaymi (may Allah have mercy on him) says that a man said to his wife: "O my sister!" The Messenger of Allah (peace and blessings be upon him) asked: "Is she your sister?" He (peace and blessings be upon him) disliked it and forbade it.
(b) Abu Tamimah (may Allah have mercy on him) narrates from a man of his people that he heard the Prophet (peace and blessings be upon him), and the Prophet (peace and blessings be upon him) heard a man calling his wife 'sister', so he (peace and blessings be upon him) forbade him from that.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الخلع والطلاق / 15146