Code of Civil Procedure Article 302
Except as otherwise provided by the laws, every person is under a general duty to testify in an action between others.
中文原文 民事訴訟法第302條
除法律別有規定外，不問何人，於他人之訴訟，有為證人之義務。
English translation for reference only; the Chinese text prevails. Not legal advice.