Jamieson, Fausset and Brown on Isaiah 48:21

21. Ezra, in describing the return, makes no mention of God cleaving the rock for them in the desert [Kimchi]. The circumstances, therefore, of the deliverance from Egypt (Ex 17:6; Nu 20:11; Psa 78:15; 105:41) and of that from Babylon, are blended together; the language, while more immediately referring to the latter deliverance, yet, as being blended with circumstances of the former not strictly applicable to the latter, cannot wholly refer to either, but to the mystic deliverance of man under Messiah, and literally to the final restoration of Israel.