The Eternal One spoke to Moses on Mount Sinai: "Speak to the Israelite people and say to them: When you enter the land that I assign to you, the land shall observe a sabbath of the Eternal." - Leviticus 25:1-2
If you follow My laws and faithfully observe My commandments, I will grant your rains in their season, so that the earth shall yield its produce and the trees of the field their fruit. - Leviticus 26:3-4
On the first day of the second month, in the second year following the exodus from the land of Egypt, the Eternal One spoke to Moses in the wilderness of Sinai, in the Tent of Meeting, saying: "Take a census of the whole Israelite company…" - Numbers 1:1-2
The festival of Shavuot celebrates the giving of the Torah at Mount Sinai.
The Eternal One spoke to Moses: "Take a census of the Gershonites also, by their ancestral house and by their clans." - Numbers 4:21-22