Sahih al-Bukhari, Book 80, Hadith 31 (In-Book) ⓘ
Narrated Anas: Um Sulaim said to the Prophet "Anas is your servant." The Prophet said, "O Allah! increase his wealth and offspring, and bless (for him) what ever you give him."
حَدَّثَنَا سَعِيدُ بْنُ الرَّبِيعِ، حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، قَالَ سَمِعْتُ أَنَسًا، قَالَ قَالَتْ أُمُّ سُلَيْمٍ لِلنَّبِيِّ صلى الله عليه وسلم أَنَسٌ خَادِمُكَ. قَالَ " اللَّهُمَّ أَكْثِرْ مَالَهُ وَوَلَدَهُ، وَبَارِكْ لَهُ فِيمَا أَعْطَيْتَهُ " .
also referenced under: Hadith 6334 (DarusSalam) & Volume 8, Book 75, Hadith 346 (USC-MSA)