A mother vowing to pay a sum from her son's first salary to anyone who brings the glad tidings of his employment but the son then refuse to do so

A: The son should help his mother to fulfill her vow, particularly that she took it for his sake. Also, there is no harm if another person helps her to fulfill her vow. If the woman is not able to fulfill her vow, she has to offer the Kaffarah for breaking an oath. The Kaffarah is freeing a believing slave or feeding ten Miskins (needy people); each with one kilo and a half from the staple foodstuff, or clothing them. If she cannot afford any of these alternatives, she has to observe fasting for three days.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.