Musannaf Ibn Abi Shaybah 12945 — A woman who vowed to pray in fifty

It is narrated from Ibrahim concerning a woman who vowed that she would pray in fifty mosques, and collect charity from fifty houses and then give it away in charity: he instructed her not to collect the charity, because that is disobedience; she should pay the expiation for her oath and pray in the fifty mosques, because prayer is an act of obedience (to Allah).