# General Information:
"May the man be cursed"...This phrase is repeated several times in this chapter, serves as a warning to the Israelites when they will live in the Promised Land and is part of the covenant Yahweh made with Moses.
# command you today
Moses is speaking to the Israelites as a group, so the word "you" is plural.
# I command
Here "I" refers to Moses. The elders are there in agreement with Moses, but he is the only one speaking.