A dictionary of Proverbs (Oxford Paperback Reference)

NEEDS must when the Devil drives
Needs must is used elliptically for ‘one needs must (i.e. must of necessity) go’.

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  c1450 J. LYDGATE Assembly of Gods (EETS) 1. 21 Hit ys oft seyde by hem that yet lyues He must nedys go that the deuell dryues. 1602 SHAKESPEARE All's Well that ends Well I. iii. 29 He must needs go that the devil drives. 1835 SOUTHEY Doctor III. lxxxiii. Needs must go when the Devil drives. 1843 SURTEES Handley Cross III. xi. Needs must when the devil drives! . . But I’d rather do any thing than injure that poor blue-eyed beauty. 1978 T. SHARPE Throwback iii. I don’t want to marry the damned woman either, but needs must when the devil drives. 2002 Times 22 Feb. 24 Applied conscientiously in the rush hour it [the rule ‘women and children first’] would ensure that no male adult would ever reach his office on time, if at all. Needs must when the Devil drives is a more realistic motto for the Underground. ■ necessity
  

What a NEIGHBOUR gets is not lost
Often with friend instead of neighbour.

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  1567 L. WAGER Mary Magdalene D4V There is nothyng lost that is done for such a friende. 1721 J. KELLY Scottish Proverbs 198 It is no tint [not lost], a Friend gets. 1891 J. L. KIPLING Beast & Man viii. The public at large have reaped much of the crop sown by Government for its own army, but, as the Scottish saying has it, ‘What a neighbour gets is not lost.’ 1933 N. GORDON Shakespeare Murders xv. 237 ‘Every one is naturally interested in the whereabouts of a million pounds, even if it does not belong to oneself. It isn’t lost, what a friend gets.’ ‘You mean that you can always borrow from him?’ ‘I meant rather that one delights in his good fortune.’ ■ neighbours; winners and losers
  

neighbour see also GOOD fences make good neighbours.
nest see there are no BIRDS in last year’s nest; BIRDS in their little nests agree; it’s an ILL bird that fouls its own nest.