וַיֹּאמְרוּ֩ עַבְדֵ֨י פַרְעֹ֜ה אֵלָ֗יו עַד־מָתַי֙ יִהְיֶ֨ה זֶ֥ה לָ֙נוּ֙ לְמוֹקֵ֔שׁ שַׁלַּח֙ אֶת־הָ֣אֲנָשִׁ֔ים וְיַֽעַבְד֖וּ אֶת־יְהוָ֣ה אֱלֹהֵיהֶ֑ם הֲטֶ֣רֶם תֵּדַ֔ע כִּ֥י אָבְדָ֖ה מִצְרָֽיִם׃
האָבן פַּרעהס קנעכט צו אים געזאָגט: ביז וואַנען װעט דערדאָזיקער אונדז זײַן פֿאַר אַ שטרױכלונג? לאָז אַװעק די לײַט, און זאָלן זײ דינען ה׳ זײער גאָט. צי נאָך װײסטו ניט אַז מִצרַיִם גײט אונטער?
Rashi
הטרם תדע means KNOWEST THOU NOT YET that Egypt has perished. (Cf. Rashi on Exodus 9:30.)
Chizkuni
ויאמרו עבדי פרעה אליו, (after having heard this threat) “Pharaoh’s servants said to him;” when we had read previously in 9,34 that both Pharaoh as well as his servants (ministers) continued to sin, that referred to the ministers who had advised him now to let only the men go into the desert to offer sacrifices as requested.
Rashbam
?הטרם תדע; do you still not realise that Egypt will be lost by the cumulative effect of these plagues?