Akademik

Мягко стелет, да жестко спать
The person conceals his ill intentions beneath outward politeness. See Говорит бело, а делает черно (Г), Кошачья лапка мягка, да коготок востер (K), На языке медок, а на сердце ледок (H), Слово бело, да дело черно (C)
Cf: Bees that have honey in their mouths have stings in their tails (Br.). Fine words dress ill deeds (Br.). Full of courtesy, full of craft (Br.). Many a one says well that thinks ill (Br.). Many kiss the hand they wish to cut off (Am., Br.). Many kiss the hand they wish to see cut off (Am.). There are daggers behind men's smiles (Am.). Too much courtesy, too much craft (Am.)

Русско-английский словарь пословиц и поговорок. . 2013.