Yeshua the Messiah (Jesus the Christ) emphasized that vows and oaths are not to be taken lightly (Matthew 5:33-37). Why then did the Holy One of Israel give instructions about vows and oaths? Part of it is our distance from the original language and meanings of these words. Another part is we aren’t seeing the lessons from Heaven in these instructions, namely, that just as the LORD promises to give a land of rest to Israel, so too, should those who make promises be as faithful to them.
The dual Torah reading מטות Matot (“tribes,” Numbers 30-32) and מסעי Massei/Mase’y (“journeys of,” Numbers 33-36) take us to the end of the 40 years of wandering judgment against the rebellious first generation post-Mitzraim (Egypt).