וַיֹּ֗אמֶר מָ֤ה הַדָּבָר֙ אֲשֶׁ֣ר דִּבֶּ֣ר אֵלֶ֔יךָ אַל־נָ֥א תְכַחֵ֖ד מִמֶּ֑נִּי כֹּ֣ה יַעֲשֶׂה־לְּךָ֤ אֱלֹהִים֙ וְכֹ֣ה יוֹסִ֔יף אִם־תְּכַחֵ֤ד מִמֶּ֙נִּי֙ דָּבָ֔ר מִכָּל־הַדָּבָ֖ר אֲשֶׁר־דִּבֶּ֥ר אֵלֶֽיךָ׃
Lalu ia berkata: “Apakah firman yang telah Ia sampaikan kepadamu? Janganlah kiranya engkau menyembunyikannya dariku. Beginilah kiranya Allah berbuat kepadamu, bahkan lebih dari itu, jika engkau menyembunyikan dariku satu hal pun dari segala firman yang telah Ia sampaikan kepadamu.”
Rashi
Such shall [God] do to you. Like that very curse, that you shall not have worthy children. And that curse actually befell him even though he did tell him. And did not withhold. From here [the Sages concluded]: A curse of a wise man, even though pronounced on condition, will be realized.13Maseches Makos 11a.