HafizaLearn Turkish
Literal translationThe priest doesn't know how to read at his own wedding
Usage contextHumorous observation about performance anxiety
Frequencyoccasional

Example

Öğretmen ama kendi çocuğunu eğitemiyor. Papaz kendi düğününde okumasını bilmez.

Modern usage

Common when someone fails at something they're expert in

Similar English proverb

The cobbler's children go barefoot