Bamidbar 30:1-2

Orthodox Jewish Bible

30 And Moshe spoke unto the Rashei HaMattot (Heads of the Tribes) concerning the Bnei Yisroel saying, This is the thing which Hashem hath commanded:

[MATTOS]

^2 (3) If an ish vow a neder unto Hashem, or swear a shevu’ah (oath) to bind his nefesh with an issar (negative vow, prohibition), he shall not break his dever, he shall do according to all that proceedeth out of his mouth.