Numbers 15 states that there is to be one law for all people, not just Israelites. This comes in the midst of a chapter about how to offer thanksgiving offerings and is followed by the wearing of tzitzit (tassels), the physical reminder to those who see it that we are all surrounded by God’s word and presence. If even the foreigner was to wear these, that promise was made to everyone. God is the same now as he was then and he wants everyone to come to him, not just some subset of people.
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