If you make a promise, abide by it.

你如果做出诺言，就要履行诺言。

youdao

Rice said Moscow must abide by its stated promise to halt military operations.

赖斯说，莫斯科必须遵守其停止军事行动的承诺。

youdao

Once you make a promise, you must abide by it.

一旦你许诺，你必须遵守你的诺言。

youdao

In a statement on its website, the Foreign Ministry said, "We strongly urge the North Korean side to abide by its denuclearization promise" and not take any actions that could worsen the situation.

WSJ: North Korea Tests Nuclear Device

Registered nurses also promise to abide by a duty to "make the care of people your first concern, treating them as individuals and respecting their dignity".

BBC: UK