Sahih Muslim 2482a
Anas reported: Messenger of Allah ﷺ came to me as I was playing with playmates. He greeted and sent me on an errand and I made delay in going to my mother. When I came to her she said: What detained you? I said: Messenger of Allah ﷺ sent me on an errand. She said: What was the purpose? I said: It is something secret. Therupon she said: Do not then divulge the secret of Messenger of Allah ﷺ to anyone. Anas said: By Allah, if I were to divulge it to anyone, then, O Thabit, I would have divulged it to you.
حَدَّثَنَا أَبُو بَكْرِ بْنُ نَافِعٍ، حَدَّثَنَا بَهْزٌ، حَدَّثَنَا حَمَّادٌ، أَخْبَرَنَا ثَابِتٌ، عَنْ أَنَسٍ، قَالَ أَتَى عَلَىَّ رَسُولُ اللَّهِ ﷺ وَأَنَا أَلْعَبُ مَعَ الْغِلْمَانِ - قَالَ - فَسَلَّمَ عَلَيْنَا فَبَعَثَنِي إِلَى حَاجَةٍ فَأَبْطَأْتُ عَلَى أُمِّي فَلَمَّا جِئْتُ قَالَتْ مَا حَبَسَكَ قُلْتُ بَعَثَنِي رَسُولُ اللَّهِ ﷺ لِحَاجَةٍ . قَالَتْ مَا حَاجَتُهُ قُلْتُ إِنَّهَا سِرٌّ . قَالَتْ لاَ تُحَدِّثَنَّ بِسِرِّ رَسُولِ اللَّهِ ﷺ أَحَدًا . قَالَ أَنَسٌ وَاللَّهِ لَوْ حَدَّثْتُ بِهِ أَحَدًا لَحَدَّثْتُكَ يَا ثَابِتُ .