New answers tagged nedarim-shevuot
If a person decides to intentionally do something which is a "chumrah" (voluntary strict practice, not required by law) and also intends that his practice be his knew way of acting forever, (AND he is well aware that it is not obligatory,) then it has the halachic force of a neder (vow) even if he only does it one time. (see Shulchan Aruch Yoreh Deah 214:1; ...
I'm not sure about an original source, but it's mentioned in Hatarat Nedarim done on Erev Rosh Hashanah: או אֵיזו הַנְהָגָה טובָה או אֵיזֶה דָבָר טוב שֶׁנָּהַגְתִּי שָׁלשׁ פְּעָמִים וְלא הִתְנֵיתִי שֶׁיְּהֵא בְּלִי נֶדֶר (text source) ... Or any good act or good thing that i have done three times and did not stipulate that it should not be a neder ...
Shulchan Aruch Yore Dea 210 states: "A neder does not "take" until it is verbalized aloud, and the words said have to match the intention." The same rule applies by shevuot (oaths). Therefore, the person who only thought of a prohibition has not created a neder and the Coke is not prohibited to him.
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