Midrash sa Levitico 1:17: Vayikra Rabbah & Sifra

“He shall split it by its wings, but shall not separate” (Leviticus 1:17). Rabbi Yoḥanan said: The common man, if he smells the odor of wings, he is disgusted, and you say: “The priest shall burn everything on the altar” (Leviticus 1:9)? Why to that extent? It is, rather, so that the altar will be adorned with the offering of a poor person.¹⁶The bird, the offering of the poor person, looks more impressive with its feathers.
King Agrippa sought to sacrifice one thousand burnt offerings on one day. He sent and said to the High Priest, ‘let no man other than me bring [an offering] today.’ A certain poor person came with two turtledoves in his hand. He said to the priest: ‘Sacrifice these.’ He said to him: ‘The king commanded me and said to me: Let no man other than me bring [an offering] today.’ He said to him: ‘My lord High Priest, each day I trap four [birds] and I sacrifice two and support myself from two. If you do not sacrifice them, you are cutting off my sustenance.’ He took them and sacrificed them. Agrippa had a vision in a dream: The offering of a poor person preceded you. He sent and said to the High Priest: ‘Did I not command you: Let no man other than me bring [ an offering] today?’ He said to him: ‘My lord the king, a certain poor person came with two turtledoves in his hand. He said to me: Sacrifice these. I said to him: The king commanded me and said to me: Let no man other than me bring [an offering] today. He said to me: My lord High Priest, each day I trap four [birds] and I sacrifice two and support myself from two. If you do not sacrifice them, you are cutting off my sustenance. Should I not have sacrificed them?’ He said to him: ‘Everything that you did, you did well.’
There was an incident involving a certain bull that they were leading [to bring] as an offering but it would not allow itself to be led. A poor person came and in his hand there was a bundle of endives. He held it out [to the bull], which ate it. The bull vomited and expelled a needle and allowed itself to be led [and brought] as an offering. The owner of the bull had a vision in a dream: The offering of the poor person preceded you.
There was an incident involving a certain woman who brought a handful of fine flour, and the priest was disparaging her. He said: ‘Look at what they sacrifice. What is there to eat, what is there to sacrifice?’ The priest had a vision in a dream: Do not disparage her. It is as though she is sacrificing her soul. These matters can be derived a fortiori: If regarding one who does not sacrifice a soul,¹⁷One who brings a flour offering as opposed to sacrificing a living creature. the term soul is written,¹⁸The verse states: “When a person [nefesh] presents a meal offering.” The term nefesh can also mean soul. for one who does sacrifice a soul, all the more so it is as though he is sacrificing his soul.

6) And whence is it derived that the head is smoked by itself? "And the Cohein shall smoke it on the altar" (Ibid. 17) refers to the body. What, then, must "and he shall smoke" (Ibid. 15) refer to? The head. And just as we find with smoking that the head (is smoked) by itself, and the body by itself, so, with melikah, etc.

8) From here they ruled: If one designates an unblemished animal for Temple maintenance, he transgresses a positive commandment. Whence is it derived that he also transgresses a negative commandment? From (Vayikra 1:17): "And the L–rd spoke to Moses lemor" (also construable as "lo amar" ["He said not"]. These are the words of R. Yehudah. The sages say: There is no transgression here of a negative commandment.