Шмот 10:11 Комментарий: Rashi, Rashbam, Chizkuni & Siftei Chakhamim

לא כן NOT SO as you have said, to take the children with you, but 'לכו נא הגברים ועבדו את ה GO YE WHO ARE ADULT MEN AND SERVE THE LORD.

ועבדו את ה' כי אותה אתם מבקשים, you have requested from me to let you serve the Lord; what do you need women and children for? This is why Pharaoh got angry and expelled Moses and Aaron, adding that “by G’d I will not grant such an unreasonable request!” (verse 10)

לכו נא הגברים, “you, i.e. the men, may go;” the children will remain behind as guarantees that you will return.

כי אתה אתם מבקשים means FOR THAT IS WHAT YE DID SEEK till now: let us sacrifice to our God — and it is not the custom for little children to offer sacrifice.

ויגרש אותם AND HE DROVE THEM OUT — This is an elliptical phrase and it does not expressly state who drove them out (i. e. the subject of the verb is omitted).