«إذا أنفقت المرأة من بيت زوجها عن غير أمره فلها نصف أجره»
The Prophet (peace and blessings be upon him) said:
"When a woman spends from her husband's house without his instruction (that is, some ordinary charity in line with the usual custom), she too has half of his (the husband's) reward."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 403