An empty sack doesn't stand.

What it means
A sack stands only when there is something in it. One common explanation of this saying is that a person, too, must be fed and provided for in order to stand and work.
Bambara · West Africa
Source and context
From: Bambara, West Africa
Source: Bambara proverb (Bɔrɔ lankolon tɛ jɔ); documented in Bambara proverb collections (proverbicals.com/bambara, listofproverbs.com)

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