mazel tov
Concise Oxford English Dictionary © 2008 Oxford University Press:
mazel tov /ˈmaz(ə)l ˌtɔːv, ˌtɒf/
▶exclamation (among Jews) congratulations; good luck.
– origin from mod. Heb. mazzāl ṭōḇ, lit. ‘good star’.
'mazel tov' also found in these Oxford entries:

