Umm Sa'd narrates: I went to Sayyidah Aishah Siddiqah (may Allah be pleased with her) and said: O Mother of the Believers! A woman gives something from her husband's house as charity; will the reward go to the woman or to her husband? Sayyidah Aishah (may Allah be pleased with her) said: It will go to both of them. The Prophet (peace and blessings be upon him) told me this. (Allamah al-Haythami says:) I say: This hadith is reported from Sayyidah Aishah (may Allah be pleased with her) in the "Sahih": "When a woman spends from her husband's house without causing any harm, the man will get his reward, and the woman will get a reward like it."
Imam al-Tabarani recorded this narration in al-Mu'jam al-Awsat, and its chain contains a narrator whom I do not know.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الزكاة / 4762