that she said, "O Messenger of Allah ﷺ! Anas is your servant, so please invoke for Allah's blessing for him." The Prophet ﷺ said, "O Allah! Increase his wealth and offspring and bless (for him) whatever You give him."  

أَنَّهَا قَالَتْ يَا رَسُولَ اللَّهِ أَنَسٌ خَادِمُكَ ادْعُ اللَّهَ لَهُ قَالَ اللَّهُمَّ أَكْثِرْ مَالَهُ وَوَلَدَهُ وَبَارِكْ لَهُ فِيمَا أَعْطَيْتَهُ وَعَنْ هِشَامِ بْنِ زَيْدٍ سَمِعْتُ أَنَسَ بْنَ مَالِكٍ مِثْلَهُ  

The Prophet ﷺ confided to me a secret which I did not disclose to anybody after him. And Um Sulaim asked me (about that secret) but I did not tell her.  

سَمِعْتُ أَنَسَ بْنَ مَالِكٍ أَسَرَّ إِلَىَّ النَّبِيُّ ﷺ سِرًّا فَمَا أَخْبَرْتُ بِهِ أَحَدًا بَعْدَهُ وَلَقَدْ سَأَلَتْنِي أُمُّ سُلَيْمٍ فَمَا أَخْبَرْتُهَا بِهِ