Never look a gift horse in the mouth.
人家送你马，切莫看口齿。
youdao
Don't look a gift horse in the mouth.
馈赠之马，勿看牙口。
你尽管接受礼物，不必多问。自马口向里头张望。
In Texas, we actually know it is a good idea to look a gift horse in the mouth.
NPR: Texas Gov. Under Fire For Rejecting Stimulus Funds
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