if. The Hebrew Accent (Pashta) puts the emphasis on the 1st "well" and on this 2nd "if", to mark the solemn and Important alternative.
sin. sin offering. Hebrew. chata. See App-43. The word "offering" is actually added in Exodus 30:10; Leviticus 4:3; Leviticus 6:25; Leviticus 8:2.Psalms 40:6. Compare 2 Corinthians 5:21.Ephesians 5:2.
lieth. Lieth is mase. Sin offering is feminine. So that the Hebrew reads "at the entrance [a male] is lying,. sin offering".
shall be. Supply "is" instead.
and thou shalt rule. Compare Genesis 3:16.