It is narrated from Sayyiduna Hakam bin Amr Ghafari, may Allah be pleased with him, who says: My brother Rafi’ bin Amr and I went to the Commander of the Faithful, Sayyiduna Umar bin Khattab, may Allah be pleased with him. I had dyed my hair with henna and my brother had dyed his hair with a yellow color. Sayyiduna Umar, may Allah be pleased with him, said to me: This is the Islamic color, and to my brother Rafi’, he said: This is the color of faith.