疾风知劲草 (疾風知勁草) jífēng zhī jìncǎo

jífēng zhī jìncǎo phrase the storm put strong grass to the test; troubled times test a faithful minister
Domain: Proverb 谚语
Notes: Also written 疾风劲草 (CC-CEDICT '疾風知勁草'; Guoyu '疾風知勁草'; Mathews 1931 '疾風知勁草', p. 65)

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疾风知劲草,烈火见真金