# I have given to you

"I give to you". God speaks as if he had already done this because it is a decision that he had already made. 

# as a continual share

"as the portion that you will continually receive"

# an everlasting covenant of salt ... a binding covenant forever

"an agreement forever"

# an everlasting covenant of salt

"a covenant made with salt." or "a permanent covenant." or "an everlasting covenant."