וַיֹּ֛אמֶר נִרְפִּ֥ים אַתֶּ֖ם נִרְפִּ֑ים עַל־כֵּן֙ אַתֶּ֣ם אֹֽמְרִ֔ים נֵלְכָ֖ה נִזְבְּחָ֥ה לַֽיהוָֽה׃
Firaun berkata, “Kalian pemalas, ya, pemalas! Itulah sebabnya kalian berkata, ‘Mari kami pergi mempersembahkan kurban kepada Yang Mahakekal.’
Sforno
נרפים אתם נרפים, you are the ones who are lazy and delinquent in carrying out your duties. This is why I decided to make things harder so that you will be more energetic in performing your duties.
Sforno
על כן אתם אומרים נלכה נזבחה, the fact that you dream about such things shows that you are lazy. This pretext of “we want to offer meat offerings” is clear evidence that you want to simply take a holiday.