Please go and study the scriptures! Sunday is not the sabbath, it is the first day of the week! Saturday is the seventh day, and still is the sabbath.
The law was given to bring us to Christ. Christ is the end of the law to them that believe.
>> “Christ is the end of the law to them that believe.” <<
Not to those that believe his words:
Mat 5:18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
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And there is much remaining to be fulfilled.