So you keep additional sabbaths apart from the 7th day?
Sabbaths are observed according to the one who is Lord of it. His call, not mine. The entire book will describe relationships of days and months.
Here is an example
Numbers 28:16-18
16 And in the fourteenth day of the first month is the passover of the LORD.
17 And in the fifteenth day of this month is the feast: seven days shall unleavened bread be eaten.
18 In the first day shall be an holy convocation; ye shall
do no manner of servile work therein:
"
no manner of servile work" indicates a day of rest. A convocation is a time for understanding and remembering the glory of God keeping in mind that Jesus Christ is our Creator.
Leviticus 23:2-6
2 Speak unto the children of Israel, and say unto them,
Concerning the feasts of the LORD, which ye shall proclaim to be holy convocations, even these are
my feasts.
3 Six days shall work be done : but
the seventh day is the sabbath of rest, an holy convocation; ye shall do no work therein: it is the sabbath of the LORD in all your dwellings
4 These are the feasts of the LORD, even holy convocations, which ye shall proclaim in their seasons.
5 In the fourteenth day of the first month at even is the LORD'S passover.
6 And on the
fifteenth day of the same month is the
feast of unleavened bread unto the LORD: seven days ye must eat unleavened bread.
The first month is Nisan or Abib. The Bible says both. This month has 30 days according to the Hebrew calendar.
According to the Gregorian, relating Saturday to the 15th day, the 30th would be a Sunday. The 1st of the 2nd month then would be a Monday.
Exodus 16:1 And they took their journey from Elim, and all the congregation of the children of Israel came unto the wilderness of Sin, which is between Elim and Sinai, on the
fifteenth day of the second month after their departing out of the land of Egypt.
So the 15th day of the 2nd month (according to the Gregorian) would also be a Monday.
Exodus 16:4-7
4 Then said the LORD unto Moses, Behold, I will rain bread from heaven for you; and the people shall go out and gather a certain rate every day, that I may prove them, whether they will walk in my law, or no.
5 And it shall come to pass, that
on the sixth day they shall prepare that which they bring in ; and it shall be twice as much as they gather daily.
6 And Moses and Aaron said unto all the children of Israel, At even, then ye shall know that the LORD hath brought you out from the land of Egypt:
7 And
in the morning, then ye shall see the glory of the LORD; for that he heareth your murmurings against the LORD: and what are we, that ye murmur against us?
So the next day (the 16th according to the Gregorian calendar) would be a Tuesday when Israel began to gather manna.
Exodus 16:22-23
22 And it came to pass, that on the
sixth day they gathered twice as much bread, two omers for one man: and all the rulers of the congregation came and told Moses.
23 And he said unto them, This is that which the LORD hath said ,
To morrow is the rest of the holy sabbath unto the LORD: bake that which ye will bake to day, and seethe that ye will seethe ; and that which remaineth over lay up for you to be kept until the morning.
The 6th day would then be a Sunday, and the first Sabbath recording in the Bible would be a Monday, but that isn't according to the Hebrew calendar so the days of Sabbaths are our Lord's call, not ours. Back then the new moons were the sign that a new month had begun, for Israel didn't have calendar as we do. The Hebrew days of the months alternated during each year between 29 and 30 days. With this understanding we can also calculate what days that the feast of tabernacle Sabbaths (plural) were. But does it really make a difference? Maybe. Maybe not. The spiritual understanding of why God gave them is important though.
Leviticus 23:34-35 and 39
34 Speak unto the children of Israel, saying , The
fifteenth day of this seventh month shall be the feast of tabernacles for seven days unto the LORD.
35 On the first day shall be an holy convocation: ye shall do no servile work therein
39 Also in the
fifteenth day of the seventh month, when ye have gathered in the fruit of the land, ye shall keep a feast unto the LORD seven days: on the
first day shall be a sabbath, and on the eighth day shall be a sabbath.
The Lord of the Sabbath calls the shots
And he said unto them, That the Son of man is Lord also of the
sabbath. (Luke 6:5)