TT #18 · Parshas Tazria · Aliyah 1 · Passuk 3
English: On the eighth day the flesh of his foreskin shall be circumcised.
Chabad.org — Chumash, English translation + Rashi for Vayikra 12:3
Torah Temimah cites Yevamos 72b.
E-Daf — Yevamos 72b · Shas.org
English: I know only that one circumcised on the eighth day is circumcised only during the day. From where do we include one circumcised on the ninth, tenth, eleventh, or twelfth day? The Torah says, “and on the day.”
Expansion by textual inference
The verse extends the daytime requirement to delayed circumcisions as well.