«يِخْلَقْ مِنِ الشَّبَهْ أَرْبِعِينْ»

The saying holds that resemblance between people is common and expected, since the creator, God as the verb's unstated subject, fashions many individuals sharing one likeness. The number forty is a conventional round figure for an indefinite abundance, not a literal count, so the point is that no face is unique and doubles are bound to turn up.

In practice it answers surprise at a striking resemblance. Rather than treating the match as a mystery or proof of kinship, the speaker shrugs it off with good humor, reminding listeners that such coincidences belong to the ordinary order of creation.

Say it when someone is struck by how closely a stranger, acquaintance, or photo resembles another person. It lightly explains the uncanny likeness as natural, and fits casual conversation rather than formal speech.