Isa 58:9

58:9 call . . . cry. Then God will answer prayer (30:19; 65:24); in contrast see v. 4 note.

Here I am. Typically this is a courteous answer given by a person who is ready to hear a message or follow instructions (e.g., Gen. 22:1, 7; Ex. 3:4; 1 Sam. 3:4).

yoke . . . speaking wickedness. These expressions represent oppression, contempt, and improper speech (Prov. 6:13).