We found one dictionary that defines the word proverbs should come in pairs:

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1. proverbs should come in pairs: Wiktionary

▸ Words similar to proverbs should come in pairs ▸ Usage examples for proverbs should come in pairs ▸ Idioms related to proverbs should come in pairs ▸ Wikipedia articles (New!) ▸ Words that often appear near proverbs should come in pairs ▸ Rhymes of proverbs should come in pairs ▸ Invented words related to proverbs should come in pairs