Quibble - this comes from Smith. It's not specifically a Marxist complaint - just one popular with them.
Here: https://www.marxists.org/reference/archive/smith-adam/works/... (search for "In the progress of the division of labour")
Turns out there's also a wikipedia page outlining the history of this line of reasoning:
https://en.wikipedia.org/wiki/Division_of_labour#Henri-Louis...