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How do we know Moses wrote the first five books of the Bible?

It’s clear from the first five books of the Bible that Moses wrote them. While it never reads, “I, Moses, wrote down the first five books. . .”, the actions described in the book include Moses jotting down a lot of information.

Then the LORD said to Moses, “Write this on a scroll as something to be remembered and make sure that Joshua hears it, because I will completely blot out the name of Amalek from under heaven.” Exodus 17:14

When Moses went and told the people all the LORD’s words and laws, they responded with one voice, “Everything the LORD has said we will do.” Moses then wrote down everything the LORD had said. . .Then he took the Book of the Covenant and read it to the people. They responded, “We will do everything the LORD has said; we will obey.” Exodus 24:3-4, 7

Then the LORD said to Moses, “Write down these words, for in accordance with these words I have made a covenant with you and with Israel.” Moses was there with the LORD forty days and forty nights without eating bread or drinking water. And he wrote on the tablets the words of the covenant—the Ten Commandments. Exodus 34:27-28

At the LORD’s command Moses recorded the stages in their journey. This is their journey by stages: Numbers 33:2

So Moses wrote down this law and gave it to the Levitical priests, who carried the ark of the covenant of the LORD, and to all the elders of Israel. Deuteronomy 31:9

After Moses finished writing in a book the words of this law from beginning to end, he gave this command to the Levites who carried the ark of the covenant of the LORD: “Take this Book of the Law and place it beside the ark of the covenant of the LORD your God. There it will remain as a witness against you.” Deuteronomy 31:24-26

God told Moses to write it down. How would future generations know what was said? Moses spent 80 days on the mountain with God (two periods of 40). Obviously he took notes.

The following Old Testament books ascribe Moses as the author of "The Law" or "The Book of Moses" (the first five books).

(David speaking to Solomon) “I am about to go the way of all the earth,” he said. “So be strong, act like a man, and observe what the LORD your God requires: Walk in obedience to him, and keep his decrees and commands, his laws and regulations, as written in the Law of Moses. . .1 Kings 2:2-3

And they installed the priests in their divisions and the Levites in their groups for the service of God at Jerusalem, according to what is written in the Book of Moses. Ezra 6:18

The New Testament affirms this also.

Jesus replied, “Moses permitted you to divorce your wives because your hearts were hard. But it was not this way from the beginning.” Matthew 19:8

(Jesus speaking) “But do not think I will accuse you before the Father. Your accuser is Moses, on whom your hopes are set. If you believed Moses, you would believe me, for he wrote about me. But since you do not believe what he wrote, how are you going to believe what I say?” John 5:45-47

(Peter speaking) For Moses said, ‘The Lord your God will raise up for you a prophet like me from among your own people; you must listen to everything he tells you. Anyone who does not listen to him will be completely cut off from their people.’ Acts 3:22-23

(Paul writing) Moses writes this about the righteousness that is by the law: “The person who does these things will live by them.” Romans 10:5

Jesus, Peter and Paul all reference the first five books of the Bible and attribute Moses as being the author.