וַיִּקְרָא֙ גַּם־פַּרְעֹ֔ה לַֽחֲכָמִ֖ים וְלַֽמְכַשְּׁפִ֑ים וַיַּֽעֲשׂ֨וּ גַם־הֵ֜ם חַרְטֻמֵּ֥י מִצְרַ֛יִם בְּלַהֲטֵיהֶ֖ם כֵּֽן׃
האָט אױך פַּרעה גערופֿן די חכָמים און די מכַשפים, און אױך זײ, די חַרטומים פֿון מִצרַיִם, האָבן געטאָן דעס גלײַכן מיט זײערע פֿאַרבאָרגענע קונצן.
Ibn Ezra
[Daniel 2:2] Vayomer ha-melech... la-chartummim (וַיֹּאמֶר הַמֶּלֶךְ... לַֽחַרְטֻמִּים - And the king ordered... magicians): These are the sages of natural science (chakhmei ha-toladet - חַכְמֵי הַתּוֹלֶדֶת) who know the fundamental principles (ikkarim - עִקָּרִים) and the properties/outcomes (toladot - תּוֹלָדוֹת) of everything, and all actions that are performed secretly (b'lat - בְּלָט). And thus it is written regarding the magicians (chartummim - חַרְטֻמִּים) of Egypt [cf. Exodus 7:11, Exodus 7:22, etc.].
Chizkuni
בלטיהם, “with their spells.” According to Rashi, these “spells” are called such as the word means “silently,” they employed whispers to produce such illusions. Rashi had given this interpretation already on 7,11 where the spelling of the word had been slightly different.