Jamieson, Fausset and Brown on Isaiah 43:23

23. small cattle--rather, the "lamb" or "kid," required by the law to be daily offered to God (Ex 29:38; Nu 28:3).

sacrifices--offered any way; whereas the Hebrew for "holocaust," or "burnt offering," denotes that which ascends as an offering consumed by fire.

I have not caused thee to serve--that is, to render the the service of a slave (Mt 11:30; Ro 8:15; 1Jo 4:18; 5:3).

offering--bloodless (Le 2:1, 2).

wearied--antithetical to Is 43:22, "Thou hast been weary of Me." Though God in the law required such offerings, yet not so as to "weary" the worshipper, or to exact them in cases where, as in the Babylonish captivity, they were physically unable to render them; God did not require them, save in subordination to the higher moral duties (Psa 50:8-14; 51:16, 17; Mi 6:3, 6-8).