daf bit: Nazir 61
The mishna teaches: gentiles are not competent to become nazirim
(because, the g'mara says, it says "speak to the children of Israel"), but
women and slaves are able to do this. Further, this mishna teaches, the vow is
more stringent for a woman than for a slave, because a master can compel
his slave to break his vow (so long as the slave belongs to him) but a
husband cannot compel his wife.
But a mishna on the next page is going to argue the opposite, that the
slave's vow is more stringent than a woman's, because a man can annul
his wife's vow (on the day he hears about it). (61a)