Another interpretation: The Holy One, blessed be He, said to him: The first trial and the last trial I will test you with none but this same expression: "Go forth from your land," and "Go forth to the land of Moriah."
Abrahams First And Final Trials Spoken In One Phrase
Yalkut Shimoni on Torah 63:2
דָּבָר אַחֵר: אָמַר לוֹ הַקָּדוֹשׁ בָּרוּךְ הוּא: נִסָּיוֹן רִאשׁוֹן וְנִסָּיוֹן אַחֲרוֹן אֵינִי מְנַסֶּה לְךָ אֶלָּא בְּלָשׁוֹן זֶה: לֶךְ לְךָ מֵאַרְצְךָ, "וְלֶךְ לְךָ אֶל אֶרֶץ הַמֹּרִיָּה".