Reference for Menachot 213:19

פירשתי ואיני יודע מה פירשתי יביא כיום מרובה: תנא כיום טוב הראשון של חג שחל להיות בשבת:

Thus: as one may offer a meal-offering as a freewill-offering, so one may offer oil as a freewill-offering; and 'establish it in its own place': it shall be the drink-offerings [of wine]: as the drink-offerings [of wine] require three logs, so the offering of oil requi three logs. Thereupon R'Papa said to them, If Rabbi derived it from the meal-offering [he would certainly have said that the minimum quantity was one log], for all are of the opinion that we say 'Deduce from it and again from it'.

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