赴汤蹈火

fùtāng-dǎohuǒ

[go through fire and water; be ready to risk one's own life; jump into the water and walk through fire] 形容不畏艰难险阻, 奋不顾身

楚 越之俗好勇, 则有赴汤蹈火之歌。 --北齐·刘昼《新论》