Pirkei d' R. Elizer
When the men came to take their wives' gold earrings for the golden calf, the women refused to hand them over. They told their husbands, "We will not obey you and help you make an abomination that has no power or salvation." God rewarded them in this world [for this refusal] by granting them a greater degree of observance on Rosh Chodesh. And God rewards them in the World to Come by giving them the power of constant renewal which characterizes Rosh Chodesh.
(Book of our Heritage, Eliyahu Ki Tov, pg. 222)