奮不顧身

First attested in c. 93 BCE, in Sima Qian's letter to Ren An:

分别有讓，恭儉下人，常思奮不顧身以徇國家之急。其素所蓄積也。 [Classical Chinese, trad.]

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分别有让，恭俭下人，常思奋不顾身以徇国家之急。其素所蓄积也。 [Classical Chinese, simp.]

From: c. 93 B.C.E., 司馬遷 (Sima Qian),《報任少卿書》, translated by J. R. Hightower

Fēnbié yǒu ràng, gōngjiǎn xiàrén, cháng sī fènbùgùshēn yǐ xùn guójiā zhī jí. Qí sù suǒ xùjī yě. [Pinyin]

Decent in his behavior, yielding in matters of precedence, respectful, moderate, and polite to others, carried away by his enthusiasm, he never thought of himself but was ever there where his country needed him: such was his constant concern.

奮不顧身

1. to dash ahead without regard to one's personal safety