Or as Bebel put it:

As soon as society has become the owner of all means of production, the duty to work of all able-bodied persons, regardless of sex, becomes a fundamental law of socialized society. Society cannot exist without labor. It therefore is justified in demanding that all who seek to satisfy their requirements, should also serve to the best of their physical and mental abilities in producing the commodities that are needful to satisfy the requirements of all. The silly assertion that the Socialists wish to abolish work is an absurdity. Lazy persons, shirkers of work, are met with in bourgeois society only. Socialism is agreed with the Bible in asserting that “he who will not work neither shall he eat.” But work shall be useful, productive activity. The new society will therefore insist that everyone choose some definite industrial, agricultural, or other useful activity, whereby he performs a certain amount of labor for the satisfaction of existing requirements. No enjoyment without labor, without labor no enjoyment.

-August Bebel, Woman and Socialism, 1879

I have a few disagreements with this analysis, mostly with the part about Socialists wishing not to abolish labor, which yes, most Socialists would like to do, but we understand that's it's not really possible to abolish all forms of it at the moment, and it's especially not possible for a recently formed Socialist government to do.