וְיָעֵר֩ כֹּח֨וֹ וּלְבָב֜וֹ עַל־מֶ֣לֶךְ הַנֶּגֶב֮ בְּחַ֣יִל גָּדוֹל֒ וּמֶ֣לֶךְ הַנֶּ֗גֶב יִתְגָּרֶה֙ לַמִּלְחָמָ֔ה בְּחַֽיִל־גָּד֥וֹל וְעָצ֖וּם עַד־מְאֹ֑ד וְלֹ֣א יַעֲמֹ֔ד כִּֽי־יַחְשְׁב֥וּ עָלָ֖יו מַחֲשָׁבֽוֹת׃
And he shall stir up his power and his courage against the king of the south with a great army; and the king of the south shall stir himself up to battle with a very great and mighty army; but he shall not stand, for they shall devise devices against him.
Rashi on Daniel
because they will devise plans against him They will plot against him to fell him through the bribery that they will bribe his officers to betray him, as he concludes: “and those who eat his food will break him.”