For the source text click/tap here: Zevachim 66
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The first Mishna of the seventh perek begins on our daf, and it opens by teaching that a ḥatat ha-of that was done properly, on the bottom part of the altar with the proper intention, is valid. This stands in contrast with a ḥatat ha-of that is brought in the wrong place (e.g. on the upper part of the altar) or with the wrong intention (e.g. with the intention of bringing it as a burnt-offering), which would be invalid as a sacrifice.
We explore the differences between animal vs bird korbanot and the allegorical comparison with the suffering of the Schechina as a dove.