What is the meaning of "I will not rebuke you about Zevachim"?
Rashi: If you do not offer them, I will not criticize you. Radak - rather, I criticize you for sins.
Why will He not rebuke Yisrael about Korbanos?
Radak (7): There is no mention of Korbanos in Aseres ha'Dibros. This is like Shmuel said "Shemo'a mi'Zevach Tov" (Shmuel I, 15:22). Do not think that Korbanos are great in My eyes, and if you neglected bringing them, I will rebuke you. Rather, I rebuke you about Emunah and deeds.
What is the meaning of "v'Olosecha l'Negdi Tamid"?
Radak: "Lo" applies also to this. I would not criticize you if you did not offer them.
Radak (7): It is a great sin and denial 1 to offer Olos without Teshuvah. Also Nevi'im rebuked them for this, e.g. "Lamah Li Rov Zivcheichem
Perhaps this denies Hashem's knowledge of people's thoughts, for surely Hashem will not accept the Olos if He knows that they do not repent in their hearts! (PF)