(4) Moses then wrote down all the commands of the LORD. Early in the morning, he set up an altar at the foot of the mountain, with twelve pillars for the twelve tribes of Israel.

(1) Moshe received the Torah from Sinai and transmitted it to Yehoshua, and Yehoshua to the Elders, and the Elders to the Prophets, and the Prophets transmitted it to the Men of the Great Assembly. They said three things: Be deliberate in judgment, raise up many disciples and make a fence for the Torah.

(8) I believe with perfect faith that all the Torah presently in out hands is the one that was given to Moses.

And Rabbi Levi bar Ḥama said that Rabbi Shimon ben Lakish said: God said to Moses, “Ascend to me on the mountain and be there, and I will give you the stone tablets and the Torah and the mitzva that I have written that you may teach them” (Exodus 24:12), meaning that God revealed to Moses not only the Written Torah, but all of Torah, as it would be transmitted through the generations.
The “tablets” are the ten commandments that were written on the tablets of the Covenant,
the “Torah” is the five books of Moses.
The “mitzva” is the Mishna, which includes explanations for the mitzvot and how they are to be performed.
“That I have written” refers to the Prophets and Writings, written with divine inspiration.
“That you may teach them” refers to the Talmud, which explains the Mishna.
These explanations are the foundation for the rulings of practical halakha. This verse teaches that all aspects of Torah were given to Moses from Sinai.