Sforno on Numbers 11:13/ספורנו על במדבר י״א:י״ג

1מאין לי בשר?, Clearly, they know very well that I do not have any meat to give them; if so when they cry and demand “give us meat,” they as much accuse me of being able to provide them with meat but denying them their desire! This is only a crude attempt to find out if my actions as their leader have indeed been prompted by my carrying out Your command! What can I attain from You on their behalf?