The Prophet ﷺ said, "When a woman spends from her husband's household without being wasteful, she receives the reward for what she has spent, her husband receives the reward for what he earned, and the storekeeper receives a similar reward. None of them diminishes the reward of the others."
حدثنا مسدد حدثنا أبو عوانة عن منصور عن شقيق عن مسروق
قال النبي ﷺ إذا أنفقت المرأة من بيت زوجها غير مفسدة كان لها أجر ما أنفقت ولزوجها أجر ما اكتسب ولخازنه مثل ذلك لا ينقص بعضهم أجر بعض
Bukhari narrated it in Sahih Bukhari, Zakat, chapter: One who orders his servant to give charity without handing it over himself, hadith no. 1425, and Muslim, Zakat, chapter: The reward of the trustworthy custodian... etc., hadith no. 1024, from the hadith of Mansur, with this chain.