Sounds like the Father speaking based on what He said.
1 And it came to pass after these things, that Elohim did tempt Abraham, and said unto him, Abraham: and he said, Behold, here I am.
2 And He said, Take now thy son, thine only son Isaac, whom thou lovest, and get thee into the land of Moriah; and offer him there for a burnt offering upon one of the mountains which I will tell thee of.
11 And the angel of YHVH called unto him out of heaven, and said, Abraham, Abraham: and he said, Here am I.
12 And He said, Lay not thine hand upon the lad, neither do thou any thing unto him: for now I know that thou fearest Elohim, seeing thou hast not withheld thy son, thine only son from Me.
15 And the angel of YHVH called unto Abraham out of heaven the second time,
16 And said, By Myself have I sworn, saith YHVH, for because thou hast done this thing, and hast not withheld thy son, thine only son:
17 That in blessing I will bless thee, and in multiplying I will multiply thy seed as the stars of the heaven, and as the sand which is upon the sea shore; and thy seed shall possess the gate of his enemies;
18 And in thy seed shall all the nations of the earth be blessed; because thou hast obeyed My voice.