Reference for Sanhedrin 82:12
וא"ר אחא בר חנינא אמר רב אסי אמר רבי יוחנן עד כמה מברכין על החדש עד שתתמלא פגימתה וכמה אמר רבי יעקב בר אידי אמר רב יהודה עד שבעה נהרדעי אמרי עד ששה עשר
but with respectto bedikoth, if one of them answers, 'I do not know', the evidence remainsvalid, since it is still subject to refutation. Thereupon he said to them:If that is what you have to say, you have much to say thereon. But they replied:only because of your great forbearance have we said so much; had you criticizedus, we should not have saidanything.<span class="x" onmousemove="('comment',' I.e., had you criticized our arguments we should not have been able to resist yours! ');"><sup>14</sup></span> IF ONE TESTIFIES … [FOR ONE MAY HAVE BEEN AWARE OF THE INTERCALATIONOF THE MONTH etc.] Till whatdate?<span class="x" onmousemove="('comment',' I.e., until what day of the month may ignorance of the defectiveness or fullness of the last month be assumed in explanation of the discrepancy between two witnesses? ');"><sup>15</sup></span> — R. Aha b.Hanina said inthe name of R. Assi in the name of R. Johanan: Until the greater part ofthe month [has passed].<span class="x" onmousemove="('comment',' After that, contradiction as to date invalidates the evidence. The greater part of the month means one day beyond half way. ');"><sup>16</sup></span> Raba said:We too learnt likewise' IF HOWEVER, ONE SAID, 'ON THE THIRD, AND THE OTHER,'ON THE FIFTH, THEIR EVIDENCE IS INVALID. But why so? Why not assume thatthe one may have known of twointercalations,<span class="x" onmousemove="('comment',' Either consecutively or alternately. ');"><sup>17</sup></span> whilst the otherwas ignorant of both! Hence it must surely be so because, when the greaterpart of the month has passed, one knows thereof [sc. intercalation]! — [No.]In truth I might argue that even after the passing of the greater part ofthe month, one does not necessarily know [of theintercalation],<span class="x" onmousemove="('comment',' And so the question from the Mishnah is not corroborative. ');"><sup>18</sup></span> yet he must haveknown of the <i>Shofar</i>-signal:<span class="x" onmousemove="('comment',' Blown at the proclamation of the new moon, be the month full or defective. ');"><sup>19</sup></span> wemay then say that he may have erred regarding onesignal,<span class="x" onmousemove="('comment',' I.e., though knowing that the Shofar had been sounded, he may have erred once as to the day on which it was sounded. ');"><sup>20</sup></span> but not regardingtwo.<span class="x" onmousemove="('comment',' Hence the invalidity of the evidence where there is a difference of two days. ');"><sup>21</sup></span> R. Hanina also said in the name of R. Assi in R. Johanan's name: Until whatday of the month may the benediction over the new moon berecited?<span class="x" onmousemove="('comment',' A benediction is recited at each re-appearance of the new moon just as on the re-appearance of everything that is beneficial to mankind. V. J. Ber. IX, 2. 'He who sees the moon in her stage of renovation, utters: Blessed etc.' ');"><sup>22</sup></span> — Until its concavityis filled up. And how long is that? — R. Jacob b. Idi said In Rab Judah'sname: Seven days. The Nehardeans said: Sixteen [days].