A proverb meaning that even the most patient person will tolerate only so much; repeated offenses will make them lose patience.
彼女は最初は我慢していたが、仏の顔も三度とばかりに怒りをあらわにした。
She put up with it at first, but, as the saying goes, even a saint's patience has its limit, and she showed her anger.
注意は二度までにしておいたほうがいい。仏の顔も三度というからね。
It's better to limit warnings to twice. As they say, even a saint's patience only lasts three times.
彼に同じミスを三度繰り返させるわけにはいかない。仏の顔も三度だから。
We can't let him make the same mistake three times. Even a saint will lose patience.