Musar על שבת 61:6

A man should love his friends and all those near to him as well as the rest of Israel with a complete love to fulfill what is said: "And you shall love your neighbor as yourself" (Lev. 19:18). And this is a great general rule in the Torah: "That which is hateful to you do not do to your neighbor" (Shabbath 31a). And even more pertinent is the verse: "For in the image of God made He man" (Gen. 9:6). (This is commented upon in T.P. Nedarim 9:4.)