«مَا كُل طِيرْ يِتَّاكِلْ لَحْمُهْ»

Things or beings that share the same kind are not therefore equal in worth. The image is of birds, of which only some are fit to eat, but the point is moral and practical discernment, not culinary advice: within any category, some are wholesome and others harmful.

The saying urges discernment over assumption. It warns against judging an individual by the reputation of its group, whether favorably or unfavorably, and reminds the listener that outward similarity hides real differences in character and value.

Fits moments when someone assumes shared background guarantees quality, such as trusting a stranger for that reason. It works as a warning to judge each case individually, but aimed at a specific person it can sound like a harsh verdict of worthlessness.