It is narrated from Hazrat Anas (may Allah be pleased with him) that once the Prophet (peace and blessings be upon him) confided a secret to me, and I have not disclosed that secret to anyone until today. Even when my mother, Hazrat Umm Sulaim (may Allah be pleased with her), asked me about it, I did not tell her either.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 13293