Reference for Gittin 149:10

אלא אמר אביי הא מני ר"מ היא דאמר בעינן תנאי כפול והכא הא לא כפליה לתנאיה

but would he have said the same where it can be produced? No, said Abaye: the authority followed here is R. Meir, who said that a condition to be binding must be duplicated,<span class="x" onmousemove="('comment',' I.e., expressed both affirmatively and negatively. Kid. 61a ');">¹⁰</span>

Jastrow