Jamieson, Fausset and Brown on Isaiah 1:13

13. oblations--unbloody; "meat (old English sense, not flesh) offerings," that is, of flour, fruits, oil, &c. (Le 2:1-13). Hebrew, mincha.

incense--put upon the sacrifices, and burnt on the altar of incense. Type of prayer (Psa 141:2; Re 8:3).

new moons--observed as festivals (Nu 10:10; 28:11, 14) with sacrifices and blowing of silver trumpets.

sabbaths--both the seventh day and the beginning and closing days of the great feasts (Le 23:24-39).

away with--bear, Maurer translates, "I cannot bear iniquity and the solemn meeting," that is, the meeting associated with iniquity--literally, the closing days of the feasts; so the great days (Le 23:36; Joh 7:37).