#He blessed him

King Melchizedek blessed Abram.

#Blessed be Abram by God Most High, Creator of heaven and earth

"May God Most High, the Creator of heaven and earth, bless Abram." (See: [[:en:ta:vol2:translate:figs_activepassive]])

#heaven

This means the place where God lives.

#God Most High, who has given

The phrase starting with "who has given" tells us something more about God Most High. AT: "God Most High, because he has given."

#Blessed be God Most High

This is a way of praising God. See how you translated "Blessed be" in [[:en:bible:notes:gen:09:26|9:26]].

#into your hand

"into your control" or "into your power"