دود الجبن من فيه The maggot is from the cheese itself.

A Syrian proverb from Arabic Proverbs Collected by Mrs. A.P. Singer by Enno Littleman:


دود الجبن من فيه
(dud ilgibna minu feehu)
Literal meaning: The maggot is from the cheese itself.
Meaning: a problem in the family is caused by one of its members.Versions of this proverb are apparently found in Egypt and Morocco.