General Information:

Moses speaks to the Israelites as if they were one man, so the words "you" and "your" here are singular. (See: rc://en/ta/man/jit/figs-you)

to enter into the covenant of Yahweh your God and into the oath that Yahweh your God is making with you today

"to agree to the covenant and to swear that you will obey all that Yahweh your God commands"