What did the angel say to Abraham in the story of the near sacrifice of Isaac?

Genesis 22:11-12. And the angel of the Lord called unto him (to Abraham) out of the heavens, and said: "Abraham, Abraham." And he (Abraham) said: "Here am I." And he (the angel) said: "Lay not your hand upon the lad, nor do any thing to him; for now I know that you are a God-fearing man, seeing as you have not withheld your son, your only son, from Me."

And again later (vereses 15-18):

And the angel of the Lord called unto Abraham a second time from the heavens, and said: "By Myself have I sworn, says the Lord, that because you have done this thing, and have not withheld your son, your only son, I will surely bless you, and I will surely multiply your seed as the stars of the heaven, and as the sand which is upon the seashore; and your seed shall possess the gate of his enemies; and through your seed shall all the nations of the earth be blessed; because you have hearkened to My voice."