Extra Credit · Rashi
English: She shall remain thirty-three days in the blood of her purification; she shall touch no consecrated thing and shall not enter the sanctuary until her days of purification are completed.
Chabad.org — Chumash, English translation + Rashi for Vayikra 12:4
Rashi on Vayikra 12:4
Sefaria — Rashi on Vayikra 12:4
English: “She shall remain” uses a verb of staying or waiting. “In the blood of purification” means that even if she sees blood during this period, she is considered pure.
Rashi explains both the language of remaining through the purification period and the legal meaning of “blood of purification”: bleeding during this defined period does not by itself make her impure.