go through fire and water   (TTS發音)

suffer or experience danger or trouble赴湯蹈火；冒生命危險

    These heroes have gone through fire and water for the revolutionary cause. 這些英雄為了革命事業赴湯蹈火。

    He said that he would go through fire and water to find out the truth of that matter. 他說為了查明那件事的真相，他將不顧個人安危。