Don't count your chickens before they hatch
no βɛndas la pjel ðel oso antes ðe kaθaɾlo
In Spanish No vendas la piel del oso antes de cazarlo.
This proverb emphasizes the importance of not celebrating success prematurely.
Example
"He was already planning his victory party, but I told him, 'No vendas la piel del oso antes de cazarlo.'"