Achanikaye kwenye mpini hafi njaa

The person who gets blisters from the hoe-handle will not die of hunger.

What it means
Blisters from the hoe are the mark of someone who has worked the land. The proverb says that a person who works hard will have enough to eat.
Swahili · East Africa
Source and context
From: Swahili, East Africa
Source: Swahili (East Africa) oral-tradition proverb (Achanikaye kwenye mpini hafi njaa), Swahili Proverbs project, Department of African Studies, University of Illinois (swahiliproverbs.afrst.illinois.edu) — hoe-handle entry

The source explains it: a diligent worker will reap the fruits of his industry. The wording of the meaning is ours.