Truth is like sugarcane; even if you chew it for a long time, it is still sweet.

What it means
Sugarcane stays sweet however long it is chewed. The proverb says the same of truth: it does not lose its value however long it is examined.
Malagasy · East Africa
Source and context
From: Malagasy, East Africa
Source: Malagasy (Ohabolana) proverb. Earlier recorded here as documented in Global Literature in Libraries Initiative's Ohabolana article and on textivors.com; neither, fetched directly, contains it. No alternate primary source has been confirmed; the wording is corroborated only by secondary listicle sites.

The meaning given here is our own reading. Other interpretations exist.