Ayenbite of Inwyt

"One rotten apple will spoil the whole barrel."

"Hi byeþ ase þe wedercoc þet is ope þe steple, þet him went mid eche wynde."

"A roted eppel amang þe holen: makeþ rotie þe yzounde."

"Zuo longe geþ þet pot to þe wetere: þet hit comþ to-broke hom."

"Moche uolk of religion зetteþ þe зuolз be-uore þe oksen."

"Don't put the cart before the horse."

"One rotten apple will spoil the whole barrel. or One scabbed sheep mars the whole flock."