Deuteronomy 1:12 (ESV)

12 How can I bear by myself the weight and burden of you and your strife?

Moses reiterates, though now with greater emphasis, his words in Deuteronomy 1:9: he speaks of the nature of his responsibility for the Israelites, particularly their weight, burden, and strife (or disputes). One leader does not need to deal with all the problems on his own.