turn the other cheek
US /tɜrn ðə ˈʌðər tʃiːk/
UK /tɜrn ðə ˈʌðər tʃiːk/

1.
to respond to an attack or insult by not retaliating and showing forgiveness or patience
:
•
When he insulted me, I decided to turn the other cheek and walk away.
•
It's hard to turn the other cheek when you feel wronged.