Or HaChaim on Numbers 11:12/אור החיים על במדבר י״א:י״ב

1 האנכי הריתי את כל העם הזה, "Did I conceive this whole people?" The reason that Moses made such an apparently inappropriate comparison is based on Sanhedrin 19 where we are told that whoever teaches the son of his friend Torah is considered as if he had given birth to him. There is also a comment in Tikkuney Hazohar 70 that all the souls of the people who marched through the desert were "branches" of Moses' own soul and that he was considered the father of all those souls.

2Moses may have alluded to two periods in the life of a son when the father is responsible for his deeds. The first period is an obligation of a biblical nature such as before the son reaches the age of five or six when he commences to study Torah. The second period is a rabbinic decree. According to the rabbis the father is responsible for misdemeanours committed by his son until the son reaches the age of 13 (compare Ketuvot 49 and 68 respectively). Although at the time Moses asked this question the Talmud had not yet added the additional years that a father is responsible for his son, it is something most people will accept readily, especially Moses who was a prophet. In view of the fact that Abraham is reputed to have observed all the rabbinic ordinances already in his time (Yuma 28) although they had not yet been instituted, Moses, with his prophetic insight certainly was aware of all these ordinances. Concerning the period during which a father is responsible for the deeds of his son by biblical injunction Moses asked האנכי הריתי, "did I conceive them?" Concerning the period during which a father is responsible for the deeds of his son by rabbinic ordinance he asked אם אנכי ילדתיהו "did I give birth to them?"

3The meaning of the letter ה in the word האנכי is one that expresses confirmation, i.e. willingness to accept the premise implied in both G'd's legislation and rabbinic ordinances. Had the children of Israel been minors, Moses would gladly have shouldered the responsibility that Jewish law imposes upon him. He complained that he should not be expected to shoulder that responsibility for people who had long since become adults and were responsible for their own actions. Even if the Israelites had been his own biological children he would long since have been free of the burden of being saddled with their mistakes. He added -by inference- that if he would have been asked to provide something minor for the Israelites, he would gladly have provided it providing it would be in his power to do so; however, how could he be expected to supply a whole nation with meat in the middle of the desert? By asking מאין לי בשר, Moses also implied that the request did not even constitute something necessary for the wellbeing of the people, it was merely a luxury!