Bahá’u’lláh has proclaimed the oneness of the world of humanity. He has caused various nations and divergent creeds to unite. He has declared that difference of race and color is like the variegated beauty of flowers in a garden. If you enter a garden, you will see yellow, white, blue, red flowers in profusion and beauty—each radiant within itself and although different from the others, lending its own charm to them. Racial difference in the human kingdom is similar. If all the flowers in a garden were of the same color, the effect would be monotonous and wearying to the eye. Therefore, Bahá’u’lláh hath said that the various races of humankind lend a composite harmony and beauty of color to the whole. Let all associate, therefore, in this great human garden even as flowers grow and blend together side by side without discord or disagreement between them.
(‘Abdu’l-Bahá, The Promulgation of Universal Peace, p. 68-69)

From the Bahá’í perspective, racism is one of the most baneful and persistent evils in society. Racial discrimination is baneful because it violates the dignity of human beings. And yet it persists. Racism is poisonous because it cripples its victims, corrupts its perpetrators, and blights human progress. And yet it persists. Why? We believe that racism persists precisely because it is deeply rooted in outdated attitudes and erroneous beliefs. Accordingly, any campaign to eradicate racism must change those attitudes and beliefs.
(Bahá’í International Community, 1989 Feb 08, Eliminating Racism)

In the human kingdom itself there are points of contact, properties common to all mankind; likewise, there are points of distinction which separate race from race, individual from individual. If the points of contact, which are the common properties of humanity, overcome the peculiar points of distinction, unity is assured. On the other hand, if the points of differentiation overcome the points of agreement, disunion and weakness result. One of the important questions which affect the unity and the solidarity of mankind is the fellowship and equality of the white and colored races. Between these two races certain points of agreement and points of distinction exist which warrant just and mutual consideration. The points of contact are many; for in the material or physical plane of being, both are constituted alike and exist under the same law of growth and bodily development. Furthermore, both live and move in the plane of the senses and are endowed with human intelligence. There are many other mutual qualifications. In this country, the United States of America, patriotism is common to both races; all have equal rights to citizenship, speak one language, receive the blessings of the same civilization, and follow the precepts of the same religion. In fact numerous points of partnership and agreement exist between the two races; whereas the one point of distinction is that of color. Shall this, the least of all distinctions, be allowed to separate you as races and individuals? In physical bodies, in the law of growth, in sense endowment, intelligence, patriotism, language, citizenship, civilization and religion you are one and the same. A single point of distinction exists—that of racial color. God is not pleased with—neither should any reasonable or intelligent man be willing to recognize—inequality in the races because of this distinction.
(‘Abdu’l-Bahá, The Promulgation of Universal Peace, p. 67-68)

Racism retards the unfoldment of the boundless potentialities of its victims, corrupts its perpetrators, and blights human progress. Recognition of the oneness of mankind, implemented by appropriate legal measures, must be universally upheld if this problem is to be overcome.
(The Universal House of Justice, 1985 Oct, The Promise of World Peace, p. 3)