Reference for Sukkah 59:5
ופליגא דר' יצחק דא"ר יצחק בר נחמני אמר שמואל לא שנו אלא ביום טוב ראשון אבל ביום טוב שני מתוך שיוצא בשאול יוצא נמי בגזול
And Rabbi Yitzchak argued with him, For Rabbi Yitzchak quoted, "Shmuel said: 'They did not teach [that a stolen Lulav is invalid], except for on the first day of the holiday; but on the second day of the holiday, because he can fulfill his obligation with a borrowed [Lulav], he can fulfill his obligation also with a stolen [Lulav].
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