TT #58 · Parshas Tazria · Aliyah 1 · Passuk 8
English: If, however, her means do not suffice for a sheep, she shall take two turtledoves or two pigeons, one for a burnt offering and the other for a purgation offering. The priest shall make expiation on her behalf, and she shall be pure.
Chabad.org — Chumash, English translation + Rashi for Vayikra 12:8
Torah Temimah cites Yevamos 74b for the stages at which a person may eat maaser, terumah, and consecrated food.
E-Daf — Yevamos 74b · Shas.org · Sefaria — Yevamot 74b, source text and translation
English: After immersion, he may eat maaser; after sunset, he may eat terumah; after bringing his atonement offering, he may eat consecrated food.
Textual derivation
The Torah distinguishes three stages of purity: maaser after immersion, terumah after sunset, and consecrated food only after the required atonement offering.