Vous avez cherché: reductio ad unam (Latin - Anglais)

reductio ad finem
the reduction of the end

dicens si venerit esau ad unam turmam et percusserit eam alia turma quae reliqua est salvabitu
and said, if esau come to the one company, and smite it, then the other company which is left shall escape.

si quis autem odio habens proximum suum insidiatus fuerit vitae eius surgensque percusserit illum et mortuus fuerit fugeritque ad unam de supradictis urbibu
but if any man hate his neighbour, and lie in wait for him, and rise up against him, and smite him mortally that he die, and fleeth into one of these cities:

cum ad unam harum confugerit civitatum stabitque ante portam civitatis et loquetur senioribus urbis illius ea quae se conprobent innocentem sicque suscipient eum et dabunt ei locum ad habitandu
and when he that doth flee unto one of those cities shall stand at the entering of the gate of the city, and shall declare his cause in the ears of the elders of that city, they shall take him into the city unto them, and give him a place, that he may dwell among them.

sed abisse simpliciter cum eo in silvam ad ligna caedenda et in succisione lignorum securis fugerit manu ferrumque lapsum de manubrio amicum eius percusserit et occiderit hic ad unam supradictarum urbium confugiet et vive
as when a man goeth into the wood with his neighbour to hew wood, and his hand fetcheth a stroke with the axe to cut down the tree, and the head slippeth from the helve, and lighteth upon his neighbour, that he die; he shall flee unto one of those cities, and live: