Midrasch zu Dewarim 32:44

(Devarim 32:44) "And Moses came": It is written here "And Moses came," and elsewhere, (Ibid. 31:1) "And Moses went." It cannot be said "And Moses came," for it is already said "And Moses went"; and it cannot be said "And Moses went," for it is already said "And Moses came." It must be understood, then, as: His time came to an end and his authority was given to another (Joshua).