You really don't know who is making dua for you behind your back esp those you do good to
If that person loves and remembers Allah often they will remember your goodness and ask Allah to bless you. There is nothing like someone coming up to you and saying I made or I make duaa for you
" Perhaps you might be asleep while the doors of Heaven are knocking with tens of supplications for you, by a poor person you aided or a sad person you cheered up or a distressed person you brought relief to. Therefore, do not underestimate doing good at all"
Ibn Al Qayyim
