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>> “where does it say in scripture that holy convocations can occur on work days?” <<
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In Leviticus, where the method of determining the times of those convocations is given.
Each of those days, except for Shavuot, is capable of falling either on a Sabbath, or on a regular day.
Shavuot can only fall on the first day of the week, since it is determined by counting the seven Sabbaths, making it the 50th day (thus “Pentecost”)
It is Shavuot that best demonstrates that what you have said is total nonsense.
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Actually, I am glad you brought up pentecost..
On His calendar, pentecost always lands on the 4th weekly Sabbath, the 29th day of the 4th month.
It falls in a summer month, a month that grapes are ready for ‘new wine’. And new wine was confirmed in the new testament Acts..
People miss that Torah actually says that after the 7th Sabbath, one is the to count 50 days. (Lev 23:16)
That 50 days counted after the seventh Sabbath will fall on a weekly Sabbath..
It actually helps to confirm His calendar.. and His ‘agriculture’ that you have a habit of mentioning has grapes ready for that new wine discussed in Acts in the 4th month, a summer month..
Pentecost, just like all the other holy days, naturally are to fall on a weekly Sabbath. And they would be a High Sabbath when Leviticus details it.
It truly is a calendar that fits perfectly. The pattern of new moon day, six work days and seventh day Sabbath is confirmed in the exodus before it was confirmed in or Messiah’s life..
It is impossible to see it with the pope’s calendar.
It is your reliance on rabbinic tradition and the popes calendar that blinds you..