“Hashem said to Avram, Go for yourself from your land … to the land that I will show you. I will make you into a great nation…” (Breish’t, Perek 12, posukim 1 & 2) Lech Lecha, the “Aliyah Parsha.”
Rashi writes on the posukim, “For your benefit and good. It is there that I will make you a great nation …” (Rashi on Breish’t, Perek 12, posuk 1)
Sefat Emet asks;
“if G’d himself promised… that the move would be for his good and his benefit, why should this have been such a great test?” It seems that it was exactly because of Hashem’s promise to him that the test was of greater magnitude because when Avram actually went, he did so “as Hashem had spoken to him.” (Breish’t Perek 12, posuk 4)