Mishneh Torah — Positive Mitzvot מצוות עשה, Chapter 206
The full Hebrew text of Mishneh Torah, Positive Mitzvot, Chapter 206, with English translation by Maimonides (Rambam).
לאהוב כל בני אדם מבני ברית, שנאמר: "וְאָהַבְתָּ לְרֵעֲךָ כָּמוֹךָ" (ויקרא יט, יח).
To love every member of our people, as [Leviticus 19:18] states: "And you shall love your neighbor as yourself."