Yes, no matter how big or small.

This quote emphasizes the importance of putting effort and care into tasks to achieve quality outcomes. It suggests that it is better to do fewer things well than many things hastily. Quality should always be prioritized in one's actions and endeavors.

This is listed as a proverb; meaning no one is actually credited with the first time it was said.

The earliest I know of is the quote;"In truth, whatever is worth doing at all is worth doing well. This is recorded a letter dated 1746 from Lord Chesterfield of England"

I hope this helps

The children's book that repeats the phrase "If a job is worth doing it's worth doing well" is "The Muffin Muncher" by Stephen Cosgrove.

Using a search on Google Books, and progressively refining the date, the earliest version I find is from this Letter to his Son by Chesterfield, published after his death in 1774: "Whatever is worth doing at all is worth doing well."