Labor Standards Act Article 42

An employer shall not compel a worker to accept work beyond regular working hours if the worker is unable to do so on account of poor health or other proper reasons.
中文原文 勞動基準法第42條
勞工因健康或其他正當理由,不能接受正常工作時間以外之工作者,雇主不得強制其工作。

English translation for reference only; the Chinese text prevails. Not legal advice.