Sayyidah Ra'itah (may Allah be pleased with her), the wife of Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him), was a skilled craftswoman; she would sell some of her handiwork and give in charity. One day she said to Abdullah (may Allah be pleased with him): "You and your children have kept me occupied, so while I am with you I am not able to give anything in charity." At this he said: "Would you not like to have a double reward?" So the two of them asked the Prophet (peace and blessings be upon him) about this, and he (peace and blessings be upon him) said: "You have the reward of what you have spent on them."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21036