A beautiful Dua narrated by Anas bin Malik ra
“O Allah! Increase his wealth and offspring and bless (for him) whatever You give him.”
اللَّهُمَّ أَكْثِرْ مَالَهُ وَوَلَدَهُ وَبَارِكْ لَهُ فِيمَا أَعْطَيْتَهُ
Narrated Um Sulaim:that she said, “O Allah’s Messenger (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.”
Ref: Sahih al-Bukhari 6344 :Mentioned in the chapter of “The invocation of the Prophet (saws) for his servant”
Thabit reported on the authority of Anas:The Apostle of Allah (ﷺ) came to us and there was none in our house but I, my mother and my aunt Umm Haram. He (the Holy Prophet) said: Stand up so that I may lead you in prayer (and there was no time for prescribed prayer). He led us in prayer. A person said to Thabit: Where stood Anas with him (the Holy Prophet)? He replied: He was on the right side. He then blessed us, the members of the household with every good of this world and of the Hereafter. My mother said: Messenger of Allah (and then, pointing towards Anas, said), here is your little servant, invoke the blessing of Allah upon him too. He then blessed me with every good, and he concluded his blessings for me (with these words): Allah! increase his wealth, and his children and make (them the source of) blessing for him.
Ref: Sahih Muslim 660 a , The Book of Mosques and Places of Prayer