Reference for Megillah 16:7

אין בין טהור מתוך הסגר לטהור מתוך החלט אלא תגלחת וצפרים:

There is no difference between a metzora who has been declared clean after being under observation and one who has been declared clean after having been a definite metzorah except shaving and [sacrificing] the birds.

Jastrow