Negaim 5:4 - 5:5

בין אישר אחד – even though that which ever you turn, he has one bright white spot in the flesh that has spread, that which at its outset was like a split Cilician bean and now is like a Sela, he is fit to be declared a certified leper, nevertheless, since he (i.e., the Kohen) doesn’t know on which plague is declaring him to be a certified leper, he (i.e., the person) is pure, from the decree of the Scriptural verse, as it is written (Leviticus 13:22): “If it should spread in the skin, the priest shall pronounce him impure; [it is an affection],” the definitive plague he declares impure, but he doesn’t declare impure but he doesn’t defile the plague where he has doubt.

בין בשני אנשים – even though that one of them requires being shut up/isolated for seven days a second time at the end of the first week, and the other is a certified leper, but sine he doesn’t know which to shut up and which to declare a certified leper, both of them are pure from the decree from the Scriptural verse.

ר' עקיבא אומר כו' – but the Halakha is not according to Rabbi Akiba.

שניהם טמאים – since it spread in both of them.

אף על פי שחזרו להיות כסלע – for now one of them is ritually pure, but since they were obliged to regard themselves/obligate themselves for defilement, both of them are impure, as it is written (Leviticus 13:23): “[But if the discoloration remains stationary, not having spread, it is the scar of the inflammation] the priest shall declare him pure”/"וטהרו הכהן" - that which is definitive, he (i.e., the Kohen) declares pure, but he does not declare pure the doubtful (see also Sifra on his verse in Leviticus).

עד שיחזרו להיות גריס – that now, certainly both of them are ritually pure, that the spreading that on whose account they were declared to be certified lepers has disappeared from both of them.