The Gemara in both Taanit (27b) and Megilla (31b) say that Avraham asked HaShem how the Jews would repent without a temple. HaShem answers that He already enacted a portion of korbanos to say and it would be as if we gave the korbanos. I will post the Gemarafrom Megilla below.
My question is this: people refer to korbanos as the entire davening between birchos hashachar and pesukei de'zimra. However, my siddur breaks it down into three sections: akeida, korbanos, and ketores. Korbanos is pretty short. So, when the Gemara refers to us saying Korbanos, is it all three, sections, just the one section, or something else overall?
Source: Megilla 31b
אמרלפניורבש"עבמהאדעאמרלוקחהליעגלהמשולשתוגו'אמרלפניורבש"עתינחבזמןשביתהמקדשקייםבזמןשאיןביתהמקדשקייםמהתהאעליהםאמרלוכברתקנתילהםסדרקרבנותכלזמןשקוראיןבהןמעלהאניעליהןכאילומקריביןלפניקרבןומוחלאניעלכלעונותיהם:
Abraham then said before Him: Master of the Universe: “By what shall I know this?” God said to him: “Take Me a heifer of three years old” (Genesis 15:9). With this, God intimated to Abraham that even if his descendants will sin, they will be able to achieve atonement through sacrificing offerings. Abraham said before Him: Master of the Universe, this works out well when the Temple is standing and offerings can be brought to achieve atonement, but when the Temple will no longer be standing, what will become of them? God said to him: I have already established for them the order of offerings, i.e., the verses of the Torah pertaining to the halakhot of the offerings. Whenever they read those portions, I will deem it as if they sacrificed an offering before Me, and I will pardon them for all of their iniquities.