«لَمَّا انْتَ عَامِلْ جَمَلْ بَعْبَعْتْ لِيهُ امَّالْ؟»

The saying confronts a person who willingly took on a hard, load-bearing role and then complains about its weight. Having cast yourself as the beast of burden, you forfeit the right to groan, since carrying heavy loads is exactly what that role involves.

More broadly, it points out the inconsistency between accepting a responsibility and resenting its natural demands. Whoever chooses endurance should show endurance, and complaint after the fact undermines the very commitment the person freely made.

Said, often teasingly or sharply, to someone who volunteered for or accepted a heavy duty and now complains about it. It reminds them that the burden was their own choice, so protest is out of place. It can sound dismissive if aimed at genuine hardship.