וַיֹּ֥אמֶר לִ֖י עַבְדִּי־אָ֑תָּה יִשְׂרָאֵ֕ל אֲשֶׁר־בְּךָ֖ אֶתְפָּאָֽר׃
Und sprach zu mir: Mein Knecht bist du, Israel, an dem ich mich verherrliche.
Ibn Ezra on Isaiah
Israel.3A. V., O Israel. That is, Thou art an Israelite of whom I am proud; or Thou art Israel, thou art estimated in mine eyes like all Israelites together. I prefer this latter explanation.