Commentary for Daniel 1:8

וַיָּ֤שֶׂם דָּנִיֵּאל֙ עַל־לִבּ֔וֹ אֲשֶׁ֧ר לֹֽא־יִתְגָּאַ֛ל בְּפַתְבַּ֥ג הַמֶּ֖לֶךְ וּבְיֵ֣ין מִשְׁתָּ֑יו וַיְבַקֵּשׁ֙ מִשַּׂ֣ר הַסָּרִיסִ֔ים אֲשֶׁ֖ר לֹ֥א יִתְגָּאָֽל׃

But Daniel purposed in his heart that he would not defile himself with the king’s food, nor with the wine which he drank; therefore he requested of the chief of the officers that he might not defile himself.

Rashi on Daniel