2 sentences

1. 我以我的生命起誓。

   wǒ yǐ wǒ de shēng​mìng qǐ​shì.

   I swear on my life.

   Source: OpenSubtitles

2. 他向上天起誓，永远不会背叛他的国家。

   tā xiàng shàng​tiān qǐ​shì, yǒng​yuǎn bù huì bèi​pàn tā de guó​jiā.

   He swore to heaven that he would never betray his country.

   Source: Dong Chinese Dictionary