"your brother": We are hereby taught that all those liable to kareth (cutting off), who receive stripes, are absolved from their kareth, it being written "and your brother be demeaned before your eyes" — Once he has been smitten," regard him as your brother.
R. Chanina b. Gamla says: The entire day Scripture calls him "wicked," viz. (Ibid. 2) "Then it shall be, if liable to stripes is the wicked one." But once he has been smitten Scripture calls him "your brother," viz.: "and your brother be demeaned." Now if a man commits one transgression, his soul is taken from him (i.e., he receives kareth), then, if he does one mitzvah (after being smitten), how much more so (is it to be inferred that) his soul is restored to him.