Brother, they will "fall" if they disobey the Sabbath like those that died in the desert. God punished them for their disobedience by not allowing them to enter His Sabbath for 40 years, with Manna in the desert being half a day too late to enter the Sabbath near Jerusalem. In the book of Hebrews, the Sabbath kept as the seventh day of the week is corrected from human tradition by telling us that, during the 40 years they kept the Sabbath with Manna, they kept the wrong Sabbath, which does not enter God's rest by being late by half a day when the Sabbath is earlier in Jerusalem than the seventh day of the week. Joshua did not get the Sabbath wrong in Jerusalem, that Jesus kept as our model "Spirit" to do the same as Jesus. Joshua got the days of the week wrong, which makes their human tradition of the Sabbath wrong everywhere beside Jerusalem.
God’s promise of entering his rest still stands, so we ought to tremble with fear that some of you might fail to experience it. For this good news—that God has prepared this rest—has been announced to us just as it was to them. But it did them no good because they didn’t share the faith of those who listened to God. For only we who believe can enter his rest. As for the others, God said, “In my anger I took an oath: ‘They will never enter my place of rest,’” even though this rest has been ready since he made the world. We know it is ready because of the place in the Scriptures where it mentions the seventh day: “On the seventh day God rested from all his work.” But in the other passage God said, “They will never enter my place of rest.” So God’s rest is there for people to enter, but those who first heard this good news failed to enter because they disobeyed God. So God set another time for entering his rest, and that time is today. God announced this through David much later in the words already quoted: “Today when you hear his voice, don’t harden your hearts.” Now if Joshua had succeeded in giving them this rest, God would not have spoken about another day of rest still to come. So there is a special rest still waiting for the people of God. For all who have entered into God’s rest have rested from their labors, just as God did after creating the world. So let us do our best to enter that rest. But if we disobey God, as the people of Israel did, we will fall. (Hebrews 4:1-11 NLT)
The days of the week during the 40 years in the desert were from morning to morning, as revealed in the following passage where they are given two portions of Manna on the previous day because there will be no Manna tomorrow. Importantly, the bad news that there will be no quail tomorrow if the next day begins in the "evening" is not mentioned, because they will eat quail in the "evening" before Manna is the first thing they will not have the next day. The quail not mentioned clearly shows the days of the week beginning in the morning.
On the sixth day, they gathered twice as much as usual—four quarts for each person instead of two. Then all the leaders of the community came and asked Moses for an explanation. He told them, “This is what the LORD commanded:
Tomorrow will be a day of complete rest, a holy Sabbath day set apart for the LORD. So
bake or boil as much as you want today, and
set aside what is left for tomorrow.” So
they put some aside until morning, just as Moses had commanded. And in the morning the leftover food was wholesome and good,
without maggots or odor. Moses said, “
Eat this food today, for today is a Sabbath day dedicated to the LORD.
There will be no food on the ground today. (
Exodus 16:22-25 NLT)
United in our hope for the soon return of Jesus, Jorge
