What is this Pasuk coming to teach us?
Rashi (on Pasuk 44) 1 : The Pasuk teaches us 2 that, in the event that the Nega remains intact at the end of two weeks, the owner is once again obligated to remove the stones and practice a third week of quarantine. 3
Refer to 14:44:1:1.
Rashi: Via the Gezeirah Shavah "v'Im Bo Yavo ha'Kohen" "u'Va ha'Kohen."
See Ramban (on Pasuk 43) DH 've'Hinei Nisparesh'.