אמר רבא והוא דאמר לאו לאו תרי זימני והוא דאמר הן הן תרי זימני דכתיב (בראשית ט, יא) ולא יכרת כל בשר עוד ממי המבול ולא יהיה עוד המים למבול ומדלאו תרי זימני הן נמי תרי זימני:
It implies oath, as it is written: And the woman shall say, Amen, amen.<span class="x" onmousemove="('comment',' Num. V, 22; the priest utters the oath, the woman merely responding 'Amen'. Her response is counted as an oath, and the 'bitter waters' test her.');"><sup>21</sup></span> It implies acceptance of words, as it is written: Cursed be he that confirmeth not the words of this law to do them, and all the people shall say, Amen.<span class="x" onmousemove="('comment',' Deut. XXVII, 26. The people taking upon themselves to fulfil the words of the Law.');"><sup>22</sup></span>
Shemirat HaLashon
And, in truth, this is a wonder in my eyes. For it is the nature of a man to seek remedies and blessings from great men for success in [earning] a livelihood. And how will all the remedies and blessings help them if, G-d forbid, they are habituated to the sin of lashon hara and rechiluth, which is subject to an explicit curse [Arur] in the Torah (Devarim 27:24): "Cursed [Arur] is he who smites his friend in secret," which, according to Rashi, refers to lashon hara. And Chazal have said (Shevuoth 36a): "'Arur' — in it lies a curse; in it lies excommunication." And this [Arur] was not uttered by one man alone, but in consensus with all of Israel, in addition to the Cohanim and the Levites, as stated in Scripture. And this one [(by speaking lashon hara)] voided his blessing!
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Mesilat Yesharim
This is what the sages said in the Talmud (Shavuot 36a):"R. Eleazar said: 'No' is an oath; 'Yes' is an oath... Said Raba: But only if he said, 'No! No!' twice; or he said, 'Yes! Yes!' twice".
