Kedoshim 

קדושים

Loving another stems from the fact that all people were created in the image of God. 

Rabbi Akiva says: “You shall love your neighbor as yourself” (Leviticus 19:18); this is a fundamental principle in the Torah. One should not [think to treat his fellow as himself in all ways and] say: Since I was humiliated, let my fellow be humiliated with me; since I was cursed, let my fellow be cursed with me.<footnote data-num="3"/>  Rabbi Tanhuma said: If you do act in this way, know whom you are humiliating: [A person created in the image of God, and by extension, God. As the verse states:] “In the likeness of God He made him” (Genesis 5:1). <source>(<i>Bereshit</i> <i>Rabba</i> 24) </source>