No meat offering, which ye shall bring unto the Lord, shall be made with leaven: for ye shall burn no leaven, nor any honey, in any offering of the Lord made by fire.
Leviticus 2:11 King James Version
Yehoshua Gordon explains why leaven and honey were not acceptable as offerings in his third lecture this week (about 8:00). The leaven represents human arrogance. Unleavened bread represents humility. Honey, or any sort of sweetness to us, represents our desires. We are to give Yehovah what He wants, not what we want.
That might explain why Cain’s offering in Genesis 4 was not as acceptable as Abel’s. Cain brought an offering of the fruit of the ground while Abel brought the firstborn of his flock. Was Cain’s offering perceived as arrogance? Did it contain leaven or honey or anything sweet?
Poetry, Short Prose and Walking 