Talmud zu Daniel 1:22

Their oil. Who forbade the oil? Rav Jehudah said, Daniel forbade it. Daniel was careful not to defile himself by the king’s repast and the wine he drank³²⁷Dan. 1:8.. Rebbi Aḥa, Rebbi Tanḥum bar Ḥiyya in the name of Rebbi Joḥanan, but some say it in the name of Rebbi Joshua ben Levi: For it they were climbing up King’s Mountain and were killed for it.

³⁷³The following also is in Šabbat I, 3d line 16 ff., ש. While the sentence order there differs from here, the fact that G while following the sentence order of L very often follows the formulation of ש indicates that the two texts are essentially the same. Who forbade the oil? Rav Jehudah said, Daniel forbade it. Daniel was careful, etc³⁷⁴Dan. 1:8. The verse does not seem to mention olive oil. As the Babli explains (36a), the argument is from the continuation, that he would not defile himself by the king’s solid food and the wine of his drinks, where the plural drinks refers both to wine (whose prohibition is generally accepted) and oil (where Daniel’s action rather is an act of personal piety.) In any case, the prohibition of Gentile olive oil never was considered to have any biblical basis..