په خپله سودا هر دوکاندار قسم خوري

Pa khpala soda har dokandar qasam khori

Literal translation

Every shopkeeper swears by their own merchandise.

Contextual meaning

What it means

A person promoting their own interest is not an impartial judge of its quality.

When people use it

In everyday life

Used when evaluating advertising, sales claims, or self-praise.

Editorial record

Source and status

Source
Traditional Pashto saying; printed source not yet documented.