Rambam, Mishneh Torah, Kings and Wars 10:12
“And even for non-Jews – our sages commanded us to visit the sick and to bury their dead with the dead of the Jews and to give sustenance to their needy among the needy of the Jews – because of promoting peaceful ways. Behold there is the verse – “Hashem is good with all and he is merciful upon all of his works” (Tehilim / Psalms 145, 9) and it is said “And its ways are ways of pleasantness and all its paths are peace.” (Mishle – Proverbs 3, 17)”
Shulchan Arukh, Yoreh De’ah 151:12
“It is permitted to support their [non-Jewish] poor, and visit their sick, and bury their dead, and eulogise and comfort their mourners, because of the ways of peace.”
Shevet MiYehuda 3:70
“Lately it has become customary, to our great detriment, amongst our teachers to state that there is no real obligation towards bettering the life of non-Jews…and there is no need to encourage the community to support non-Jews with tzedakah and kindness, for any such acts are only done for the sake of darchei shalom [ways of peace] and thus have no real source in the Torah law. Therefore we must define the true concept of darchei shalom. It is not just a means to keep Judaism safe from non-Jewish hatred, but flows from the core ethical teachings of the Torah.”