Don't look a gift horse in the mouth

Cultural  

1. Don't question the value of a gift. The proverb refers to the practice of evaluating the age of a horse by looking at its teeth. This practice is also the source of the expression “long in the tooth,” meaning old.

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Don't look a gift horse in the mouth

Don’t look a gift horse in the mouth — and then post about it on social media.

From Fox News ● Feb. 28, 2019

Thus even St. Jerome, in his commentary on the Epistle to the Ephesians, says: "Don't look a gift horse in the mouth, as the vulgar proverb has it."

From The Common People of Ancient Rome Studies of Roman Life and Literature by Frank Frost Abbott