Reference for Yevamot 41:9
רב יהודה אמר מהכא (קהלת יב, ט) ואזן וחקר תקן משלים הרבה ואמר עולא א"ר אלעזר קודם שבא שלמה היתה תורה דומה לכפיפה שאין לה אזנים עד שבא שלמה ועשה לה אזנים
more rigorous? — In the case of the former,<span class="x" onmousemove="('comment',' Incest, so long as there was no Issue. ');"><sup>22</sup></span> repentance is possible; in that of the latter<span class="x" onmousemove="('comment',' False measures. ');"><sup>23</sup></span> repentance is impossible.<span class="x" onmousemove="('comment',' V. B.B. 88b. One cannot by mere repentance make amends for robbing. The return of the things robbed must precede penitence. In the case of false measures it is practically impossible to trace all the individual members of the public that were defrauded. ');"><sup>24</sup></span>