Don't count your chickens before they hatch
dʒaŋan məŋhituŋ anak ajam səbɛlum mənɛtas
In Indonesian Jangan menghitung anak ayam sebelum menetas.
This proverb is a direct equivalent, warning against counting on something before it's certain.
Example
"Dia sudah merayakan, tapi saya bilang, 'Jangan menghitung anak ayam sebelum menetas.'"
