פירוש על בבא בתרא 56:14

Advice (that is) good comes to teach us - Meaning to say, always chazaka is (/works) in one year and (the following) good advice it comes to teach us: that (he) should (keep) his document in his hand ready to prove (his ownership) and no need for witnesses (that he was there for a year) when a complaint (is raised) about him (when he comes back from the exhile).