Moses wasn't born at the time before Joseph was in Egypt. But that was their custom at the time before Moses was born.
But Moses made their customs into laws.
But before the laws, they were practicing incest and other practices that wasn't approved by God. But once the laws were established, that's when it was forbidden for them to practice their old traditions that wasn't approved by God.
There were many other Hebrew tribes that left with the twelve tribes of Israel so that the Israel tribe will not have to marry any close relatives. But before, they were marrying close relatives like Jacob (Israel) had married both of his uncle's daughters, Rachel and Leah and Lot impregnated both of his daughters and had sons and one of the sons named was Moab who an ascendant of Ruth.
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Moses was given the Laws, Statues, and Commandments written down
BY GOD. And the Laws of God always were and always will be. To stay on topic of what I was actually speaking on, Genesis 2 shows how God created life and his law of being fruitful and multiplying. But to respond to your comment, In
Mark 7:9-13, Jesus rebukes the pharisees and scribes because they question him about not performing נטילת ידיים (netilat yadayim) handwashing
tradition before they ate. That was their own tradition and
NOT Torah. If you read the verses you can clearly see Jesus referring to the Law of Moses as THE COMMANDMENTS OF GOD. This is the same problem with most Christians today. They ignore God's Laws, for their own traditions. Christmas, a pagan holiday. Easter(Astoreth) a pagan holiday explicitly condemned IN THE BIBLE. Most Christians condemn people who want to keep God's Law, while worshipping Greco Roman pagan ideology. I'll show more verse that explicitly prove God's Law always stood.
Genesis 1:1-4 God creates the heavens and the earth and shines light on the darkness, and he knew it was good. God is our husband and his people are his brides, so his brides are to be his helpmeet and spread his light to the earth, the gospel.
Genesis 1:11-12 God creates the plants, and the natural order of heterosexual reproduction through them to create seed and to be fruitful and multiply. Yes, a male flower pollinating a female flower, or multiple female flowers. Now some might ask, "Is it fair for a male flower to pollinate multiple female flowers, but a female shouldn't be pollinated by multiple male?" . The question is nonsense, because if the female flower is pollinated by many males, how can we know who the
FATHER is
. Matthew 6:24 says No one can serve 2 husbands. In
John 8:39 Yeshua says "If Abraham is your father, do the works of him". Abraham is the father made in the image of Yahweh his father, not Easter(Astoreth), not Santa Clause. Men are made in the image of God, to be husbands, sowing good seed in humble fertile ground. That humble ground being a bride of Yahweh, receiving his seeds, being fed by the light of his gospel , which in righteous love breeds life and multiplies his light over the darkness so people can come to their husband, fearing to look him in the eye and bowing their head in humility, washing his feet.
Genesis 1:26 God says lets make man to be a husband over earth and all the creatures
Genesis 2:2-3 God blesses Shabbat as the day of rest and
TO KEEP IT HOLY. This is BEFORE man was even created.
Now I can keep going but I'll go to show men of God taught the ways of God LONG before Moses.
Jasher 1:15 And it was at the expiration of a few years, that they brought an approximating offering to the LORD, and Cain brought from the fruit of the ground, and Abel brought from the firstlings of his flock from the fat thereof, and God turned and inclined to Abel and his offering, and a fire came down from the LORD from heaven and consumed it.
Jasher 2:12 And Cainan knew by his wisdom that God would destroy the sons of men for having
sinned upon earth, and that the LORD would in the latter days bring upon them the waters of the flood.
1 John 3:4 Whosoever committeth
sin transgresseth also
the law: for
sin is the transgression of the law.
Jasher 2:14 And Cainan reigned over the whole earth, and he turned some of the sons of men
to the service of God.
Jasher 3:4 And the LORD said, Rise Enoch, go forth from thy house and from the place where thou dost hide thyself, and appear to the sons of men, in order that thou mayest teach them the way in which they should go and the work which they must accomplish to enter in
the ways of God.
Jasher 5:18 And Noah was five hundred and two years old when Naamah bare Shem, and the boys grew up and went in
the ways of the LORD, in all that Methuselah and Noah their father taught them.
***Men teaching God's Laws does not mean they originally came from men***