Sahih al-Bukhari, Hadith 6380 ⓘ
Narrated Anas: Um Sulaim said (to the Prophet), "Anas is your servant; so please invoke for Allah's blessings for him." He said "O Allah! Increase his wealth and offspring, and Bless (for him) whatever You give him."
حَدَّثَنَا أَبُو زَيْدٍ، سَعِيدُ بْنُ الرَّبِيعِ حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، قَالَ سَمِعْتُ أَنَسًا ـ رضى الله عنه ـ قَالَ قَالَتْ أُمُّ سُلَيْمٍ أَنَسٌ خَادِمُكَ. قَالَ " اللَّهُمَّ أَكْثِرْ مَالَهُ وَوَلَدَهُ، وَبَارِكْ لَهُ فِيمَا أَعْطَيْتَهُ " .
also referenced under: Book 80, Hadith 76 (In-Book) & Volume 8, Book 75, Hadith 390 (USC-MSA)