Churning
The churning of milk appears once in scripture, named as the first member of a three-fold proverb in which sustained pressure produces a corresponding yield.
Pressure That Brings Forth
The sage builds his warning on a domestic figure: "For the churning of milk brings forth butter, And the wringing of the nose brings forth blood; So the forcing of wrath brings forth strife" (Prov 30:33). The dairy act sits as the lead figure in a paired sequence — churning to butter, wringing to blood, forcing wrath to strife — and the proverb's force lies in the pattern it shares: sustained agitation in any sphere yields its proper outcome. Butter itself, the named yield of the churning, is treated under a separate entry.