From: Swahili, East Africa
Source: Swahili (East Africa) oral-tradition proverb — Swahili Proverbs project, Department of African Studies, University of Illinois (swahiliproverbs.afrst.illinois.edu). Read via a text-extraction proxy (r.jina.ai) since the site's own TLS certificate is expired; its "Application" line: "More haste less speed. It is important to do a given assignment well and not to hurry for the sake of completing it."
The source explains it: It is important to do a given assignment well and not to hurry for the sake of completing it.
. The wording of the meaning is ours.