A dictionary of Proverbs (Oxford Paperback Reference)

burnt see also if you PLAY with fire you get burnt.
bury see let the DEAD bury the dead.
bush see a BIRD in the hand is worth two in the bush; GOOD wine needs no bush; do not grieve that ROSE-TREES have thorns,...
The BUSIEST men have the most leisure
Complementary to IDLE people have the least leisure and the rationale behind if you WANT something done, ask a busy person. Cf. 1866 S. SMILES Self-Help (new ed.) i. Those who have most to do.. will find the most time.

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  1884 J. PAYN Canon’s Ward II. xxxiv. It is my experience that the men who are really busiest have the most leisure for everything. 1911 Times Literary Supplement 6 Oct. 365 The busiest men have always the most leisure; and while discharging the multifarious duties of a parish priest and a guardian he found time for travelling.
  

BUSINESS before pleasure
The two nouns are frequently contrasted in other, non-proverbial, expressions. Cf. c 1640 Grobiana’s Nuptials (MS Bodley 30) 15 Well to the businesse.—On; businesse is senior to complement; 1767 T. HUTCHINSON Diary & Letters (1883) I. v. Pleasure should always give way to business.

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  1837 C. G. F. GORE Stokeshill Place III. vi. ‘Business before pleasure’ is a golden rule which most of us regard as iron. 1943 S. STERLING Down among Dead Men v. This is business, Sarge. You know what business comes before. 1986 J. HESS Strangled Prose vi. Douglas drifted past with the department chairman, engrossed in conversation. He gave me a quick nod, but steered his captive toward a sofa. Business before pleasure. 1997 R. BOWEN Evans Above xxii. 232 ‘I think I should buy you a drink first.’.. ‘Business before pleasure, major,’ Evan said. "business; work