一言为定， 决不反悔。

I give you my word and I'll never go back on it.

《新英汉大辞典》

我将用我的生命来疼你，爱你，呵护你。！永不反悔。

I will use my life to love you, love you, love you.! Never estoppel.

youdao

其实耶和华有智慧。他必降灾祸，并不反悔自己的话，却要兴起攻击那作恶之家，又攻击那作孽帮助人的。

Yet he also is wise, and will bring evil, and will not call back his words: but will arise against the house of the evildoers, and against the help of them that work iniquity.

youdao