Holier Than Thou - Biblical Contradictions

Did God command burnt offerings of the Israelites after leaving Egypt?

Jeremiah 7:22-23, "For I spake not unto your fathers, nor commanded them in the day that I brought them out of the land of Egypt, concerning burnt offerings or sacrifices: But this thing commanded I them, saying, Obey my voice, and I will be your God, and ye shall be my people: and walk ye in all the ways that I have commanded you, that it may be well unto you." (KJV)

Exodus 20:24, "An altar of earth thou shalt make unto me, and shalt sacrifice thereon thy burnt offerings, and thy peace offerings, thy sheep, and thine oxen: in all places where I record my name I will come unto thee, and I will bless thee." (KJV)

According to Exodus chapter 20, God commanded sacrifices of burnt offerings from the Israelites after leaving Egypt, however, according to Jeremiah chapter 7, he denied commanding burnt offerings of them at that time.

"Sorrow is better than laughter: for by the sadness of the countenance the heart is made better. The heart of the wise is in the house of mourning; but the heart of fools is in the house of mirth." (Ecclesiastes 7:3-4, KJV)

"Then I commended mirth, because a man hath no better thing under the sun, than to eat, and to drink, and to be merry: for that shall abide with him of his labour the days of his life, which God giveth him under the sun." (Ecclesiastes 8:15, KJV)