The Fourth Commandment
8 “Remember the Sabbath day, to keep it holy. 9 Six days you shall labor and do all your work, 10 but the seventh day is the Sabbath of the Lord your God. In it you shall do no work: you, nor your son, nor your daughter, nor your male servant, nor your female servant, nor your cattle, nor your stranger who is within your gates. 11 For in six days the Lord made the heavens and the earth, the sea, and all that is in them, and rested the seventh day. Therefore the Lord blessed the Sabbath day and hallowed it.
I hear very often people telling me that the fourth commandment tells everyone that you need to keep the seventh day holy, and yes, I’d agree. However this is not the seventh day of a recurring week. It is the seventh day of the week which fitted into the lunar month.
How do I know? Exodus 16 shows us.
1 And they journeyed from Elim, and all the congregation of the children of Israel came to the Wilderness of Sin, which is between Elim and Sinai, on the fifteenth day of the second month after they departed from the land of Egypt.2 Then the whole congregation of the children of Israel complained against Moses and Aaron in the wilderness. 3 And the children of Israel said to them, “Oh, that we had died by the hand of the Lord in the land of Egypt, when we sat by the pots of meat and when we ate bread to the full! For you have brought us out into this wilderness to kill this whole assembly with hunger.”
So thus far we know we are on the fifteenth day of the month.
4 Then the Lord said to Moses, “Behold, I will rain bread from heaven for you. And the people shall go out and gather a certain quota every day, that I may test them, whether they will walk in My law or not. 5 And it shall be on the sixth day that they shall prepare what they bring in, and it shall be twice as much as they gather daily.”
So we know that Manna was going to fall for six days, for on the sixth day they needed to gather twice as mucb. But why?
22 And so it was, on the sixth day, that they gathered twice as much bread, two omers for each one. And all the rulers of the congregation came and told Moses.23 Then he said to them, “This is what the Lord has said: ‘Tomorrow is a Sabbath rest, a holy Sabbath to the Lord. Bake what you will bake today, and boil what you will boil; and lay up for yourselves all that remains, to be kept until morning.’” 24 So they laid it up till morning, as Moses commanded; and it did not stink, nor were there any worms in it. 25 Then Moses said, “Eat that today, for today is a Sabbath to the Lord; today you will not find it in the field. 26 Six days you shall gather it, but on the seventh day, the Sabbath, there will be none.”
Because the sixth day was the day before the Sabbath. In verse 23 it says:
It was a Holy convocation – (A Sabbath of rest)
This in conjunction with the first day of the month, shown in Acts 20:6-7 shows that the Sabbaths occured on the 8th, 15th, 22nd and 29th days.