It is narrated from Hazrat Amr bin Umayyah (may Allah be pleased with him) that I heard the Prophet (peace and blessings of Allah be upon him) saying: Whatever a man gives to his wife is charity.
Hadith Referenceمسند احمد / مسند الشاميين / 17617
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد ضعيف لضعف محمد بن أبى حميد، لكنه توبع