That was in regards to the Jews that have gone astray making those burnt offerings and sacrifices to Baal and other gods, including a reference to the Queen of heaven.
Jeremiah 7:9 Will ye steal, murder, and commit adultery, and swear falsely, and burn incense unto Baal, and walk after other gods whom ye know not; 10 And come and stand before me in this house, which is called by my name, and say, We are delivered to do all these abominations? 11 Is this house, which is called by my name, become a den of robbers in your eyes? Behold, even I have seen it, saith the Lord. 12 But go ye now unto my place which was in Shiloh, where I set my name at the first, and see what I did to it for the wickedness of my people Israel. 13 And now, because ye have done all these works, saith the Lord, and I spake unto you, rising up early and speaking, but ye heard not; and I called you, but ye answered not; 14 Therefore will I do unto this house, which is called by my name, wherein ye trust, and unto the place which I gave to you and to your fathers, as I have done to Shiloh. 15 And I will cast you out of my sight, as I have cast out all your brethren, even the whole seed of Ephraim. 16 Therefore pray not thou for this people, neither lift up cry nor prayer for them, neither make intercession to me: for I will not hear thee. 17 Seest thou not what they do in the cities of Judah and in the streets of Jerusalem? 18 The children gather wood, and the fathers kindle the fire, and the women knead their dough, to make cakes to the queen of heaven, and to pour out drink offerings unto other gods, that they may provoke me to anger. 19 Do they provoke me to anger? saith the Lord: do they not provoke themselves to the confusion of their own faces? 20 Therefore thus saith the Lord God; Behold, mine anger and my fury shall be poured out upon this place, upon man, and upon beast, and upon the trees of the field, and upon the fruit of the ground; and it shall burn, and shall not be quenched. 21 Thus saith the Lord of hosts, the God of Israel; Put your burnt offerings unto your sacrifices, and eat flesh. 22 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: 23 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. 24 But they hearkened not, nor inclined their ear, but walked in the counsels and in the imagination of their evil heart, and went backward, and not forward.
That means what God requires of Israel for the Passover Lamb is not sin because this was done in honor of Him.
Exodus 12:1And the Lord spake unto Moses and Aaron in the land of Egypt saying, 2 This month shall be unto you the beginning of months: it shall be the first month of the year to you. 3 Speak ye unto all the congregation of Israel, saying, In the tenth day of this month they shall take to them every man a lamb, according to the house of their fathers, a lamb for an house: 4 And if the household be too little for the lamb, let him and his neighbour next unto his house take it according to the number of the souls; every man according to his eating shall make your count for the lamb. 5 Your lamb shall be without blemish, a male of the first year: ye shall take it out from the sheep, or from the goats:
6 And ye shall keep it up until the fourteenth day of the same month: and the whole assembly of the congregation of Israel shall kill it in the evening.
7 And they shall take of the blood, and strike it on the two side posts and on the upper door post of the houses, wherein they shall eat it. 8 And they shall eat the flesh in that night, roast with fire, and unleavened bread; and with bitter herbs they shall eat it. 9 Eat not of it raw, nor sodden at all with water, but roast with fire; his head with his legs, and with the purtenance thereof. 10 And ye shall let nothing of it remain until the morning; and that which remaineth of it until the morning ye shall burn with fire. 11 And thus shall ye eat it; with your loins girded, your shoes on your feet, and your staff in your hand; and ye shall eat it in haste: it is the Lord's passover.
12 For I will pass through the land of Egypt this night, and will smite all the firstborn in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgment: I am the Lord. 13 And the blood shall be to you for a token upon the houses where ye are: and when I see the blood, I will pass over you, and the plague shall not be upon you to destroy you, when I smite the land of Egypt. 14 And this day shall be unto you for a memorial; and ye shall keep it a feast to the Lord throughout your generations; ye shall keep it a feast by an ordinance for ever.
Again, Isaiah 66:3 is giving a metaphor for how Jews were delighting in living in sin. This is how & why God saw their sacrifices as sin also.
Isaiah 66:3 He that killeth an ox is as if he slew a man; he that sacrificeth a lamb, as if he cut off a dog's neck; he that offereth an oblation, as if he offered swine's blood; he that burneth incense, as if he blessed an idol. Yea, they have chosen their own ways, and their soul delighteth in their abominations. 4 I also will choose their delusions, and will bring their fears upon them; because when I called, none did answer; when I spake, they did not hear: but they did evil before mine eyes, and chose that in which I delighted not.
