Reference for Gittin 158:6

מאי טעמא דהא לא נח

<b><i>MISHNAH</i></b>. BETH SHAMMAI SAY THAT A MAN MAY DIVORCE HIS WIFE WITH AN OLD GET, BUT BETH HILLEL FORBID THIS. WHAT IS MEANT BY AN OLD GET? ONE AFTER THE WRITING OF WHICH HE WAS CLOSETED WITH HER.

Jastrow