"Interpreted this concerns all those who observe the Law in the House of Judah, whom God will deliver from the House of Judgement because of their faith in the Teacher of Righteousness". (Vermes)
Two things come to mind:
- "Life" here seems to mean deliverance from judgement (from a historical event or from eschatological judgement?)
- "Faith" includes observance of the Law, but also faith/trust/loyalty directed towards the Teacher of Righteousness and his teachings.