Sahih al-Bukhari Book 34, Hadith 18
The Prophet (ﷺ) said, "If a woman gives in charity from her house meals without wasting (i.e. being
extravagant), she will get the reward for her giving, and her husband will also get the reward for his
earning and the storekeeper will also get a similar reward. The acquisition of the reward of none of
them will reduce the reward of the others."
A caravan arrived (at Medina) while we were offering the Jumua prayer with the Prophet. The people left out for the caravan, with the exception of twelve persons. Then this Verse was revealed: 'But when they see some bargain or some amusement, they disperse headlong to it and leave you standing." (62.11)
The Prophet (ﷺ) said, "If a woman gives something (i.e. in charity) from her husband's earnings without his permission, she will get half his reward."