Reference for Avodah Zarah 113:13
גופא אר"נ אמר שמואל הלוקח עבדים מן העובדי כוכבים אע"פ שמלו וטבלו עושין יין נסך עד שתשקע עבודת כוכבים מפיהם וכמה א"ר יהושע בן לוי עד שנים עשר חדש
The text states: R. Nahman said in the name of Shmuel: If [an Israelite] bought slaves from an idolater, although they had been both circumcised and immersed, they render wine nesekh until idolatry is entirely banished from their lips. How long is this? R. Joshua b. Levi said: Up to twelve months.
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