The covenant between God and the Israelite nation (see Exodus ch.19 and ch.24), was made in the time of Moses, with Moses serving as the messenger. It was not just between God and Moses.
This covenant is one of obedience, to listen to God's voice (Exodus 19:5), which includes the entire Torah (24:12). God, for His part, promised to treasure the Israelites (Exodus 19:5, Deuteronomy 26:16-19). The covenant was manifested through God's giving the Ten Commandments (Exodus ch.19-20), and was finalized (by the Israelites) through the offerings described in Exodus ch.24.
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The covenant with Moses is already made and most religions hold that you cannot intercede with the Dead for a new covenant.
Moses
The three major Jewish covenants are Noah's Covenant, Abraham's Covenant, the Mosaic Covenant (Moses' Covenant.)
Moses
It must be Moses and his brother Aaron.
In the Sinai Covenant, God made a covenant with the Israelites through Moses on Mount Sinai. The covenant included the giving of the Ten Commandments and other laws which the Israelites were to follow. It established rules for the Israelites to live by, and outlined the consequences for obedience and disobedience.
The Ark of the Covenant is said to have carried the tablets of the Ten Commandments given to Moses by God, as well as Aaron's rod and a pot of manna.
According to Jewish chronology, it was made in 1312 BCE.
Moses
On Mount Sinai in Egypt, God created a covenant with the people of Israel by speaking to Moses, their leader. This occurred in Genesis chapter 34:10-28.
moses did
The b'rit (covenant) (Exodus 34:10, and many other verses).