Correct

下不为例

/ xià bù wéi lì /
Strokes

Definition

not to be repeated/not to be taken as a precedent/just this once

Example

Definition

not serve as a precedent; not to be taken as a precedent; not to be repeated

1
Zhī
zāo
  
,
xiàwéi
下不为例
  

Only this time and no more.

2
bǎozhèng
保证
xiàwéi
下不为例
  

I promise not to do it again.

Related

下不为例