《史记·七十列传·樗里子甘茂列传》
况且，秦王要察看您的此次行动，若有害于秦国而让魏国得利，秦王定要加罪于您。 
且秦王将观公之事，害秦而利魏，王必罪公。 
Besides, the King of Qin wants to observe your moves. If your actions benefit Wei and harm Qin, the King of Qin will definitely blame you.