Jamieson, Fausset and Brown on Isaiah 43:24

24. bought--for "sweet cane" (aromatic calamus) was not indigenous to Palestine, but had to be bought from foreign countries (Jr 6:20). It was used among the Hebrews to make the sacred ointment (Ex 30:23). It is often offered as a mark of hospitality.

filled--satiated (Jr 31:14). God deigns to use human language to adapt Himself to human modes of thought.

made me to serve--though "I have not caused thee to serve" (Is 43:23). Our sin made the Son of God to become "a servant." He served to save us from servile bondage (Php 2:7; He 2:14, 15).

wearied me--Though I have "not wearied thee" (Is 43:23; see Is 1:14).