Xiōngdì qíng shēn yì zhòng, wēinán shí zǒng huì tǐngshēn ér chū.
Brothers with such deep loyalty always step up in times of crisis.
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history
From 晋·温峤《重与陶侃书》, Wen Jiao's letter to general Tao Kan during the Jin dynasty: he describes their bond as 情深义重, 著于人士之口 — 'deep feeling and weighty honor, spoken of by all.' A diplomatic appeal to loyalty between generals.