The Zohar

 

השבעתי אתכם בנות ירושלים     The זהר in Parshas ויחי writes that “ בנות ירושלים” refers to the נשמה.     The Gemoro (Kesubos 111a) says on this Pasuk in שיר השירים Hashem made 3 שבועות 2 with the Bnei Yisroel and 1 with the Goyim.   1) They should not go up (to E. Yisroel) together by force (like a wall) 2) They should not rebel against the Goyim 3) The Goyim should not oppress the Yidden, harshly. The ויואל משה claims that the ג' שבועות are הלכה למעשה & applicable today. The reason we don't find any mention of the ג' שבועות in the Poskim (of the past) is that being since the time of בר כוכבא, until today (Zionism) it was unlikely for anybody to even think of rebelling against the Goyim. For a highly unusual situation, there is no need to mention such a Halacha. Many Poskim even though they opposed Zionism argue on the ויואל משה and hold that since the רי"ף, רמב"ם ,רא"ש ,טור, שו"ע & the ראשונים  on the Gemoro the רמב"ן, ריטב"א מאירי all of them fall to mention any such Halacha of ג' שבועות. it must be that there is no such Halacha. The concept of the ג' שבועות is an אגדה & not הלכה למעשה. Historically, we don't find כלל ישראל ever accepting such  a שבועה. and they won't be punished even if they were עובר on them.  שו"ת אבני נזר ב' תנ"ד