OET interlinear LEV 12:4

uW Translation Notes:

וּ⁠שְׁלֹשִׁ֥ים יוֹם֙ וּ⁠שְׁלֹ֣שֶׁת יָמִ֔ים

and=thirty day and,three_of days

Alternate translation: [And for 33 days]

Note 1 topic: figures-of-speech / possession

תֵּשֵׁ֖ב בִּ⁠דְמֵ֣י טָהֳרָ֑ה

continue in/on/at/with,blood_of purification

The phrase blood of her purification refers to the bleeding a woman experiences after childbirth. The bleeding that accompanies childbirth marks a time of waiting until she will be declared ritually pure once again. If your language would not use the possessive form for this, you could state the meaning plainly. Alternate translation: [she shall wait to be purified from the impurity of the blood that she bled during childbirth]

Note 2 topic: figures-of-speech / metonymy

עַד־מְלֹ֖את יְמֵ֥י טָהֳרָֽ⁠הּ׃

until completed days_of (Some words not found in UHB: and=thirty day and,three_of days continue in/on/at/with,blood_of purification in=all holy_thing not touch and=near/to the,sanctuary not come until completed days_of purification_of,her )

In these phrases, the author is using the term “days” to refer to a specific time, the days of her purification. He is doing this by association with the way a lifetime is made up of individual days. If it would be helpful in your language, you could state the meaning plainly. Alternate translation: [until the waiting time for her purification is ended] or [until the time she is waiting to be purified is complete]