Sforno on Exodus 19:5/ספורנו על שמות י״ט:ה׳

3And you will be a treasure among all peoples - even though all types of humans are important to me above all the lower beings, since He is represented only in them, as say Hazal (Avot): 'Humans are beloved because they were created in the Image' - still, you will be treasured among them

4...Because Mine is all the earth - and the difference between you exists in smaller or bigger amounts, despite the fact that the whole earth is Mine, and the Righteous of the Nations are important to Me without a doubt.