اَللَّهُمَّ أَكْثِرْ مَالَهُ وَوَلَدَهُ وَبَارِكْ لَهُ فِيمَا أَعْطَيْتَهُ

Allaahumma Akthir Maalahu Wa waladahu wa baarik lahu Fimaa a'taitahu

O Allah! Increase his wealth and children, and bestow Your Blessing on whatever You give him. Narrated by Anas (RA): My mother said, "O Allah's Messenger (ﷺ)! Please invoke Allah on behalf of your servant." He (ﷺ) said: (the dua is mentioned above)

Reference: Bukhari: 6344