Sayyidina Abu Hurairah (RA) reported that a man of Banu Fazarah came to the Prophet ﷺ and complained, “O Messenger of Allah, my wife has given birth to a boy with a black complexion.’ The Prophet ﷺ asked him, “Do you have camels? He said, “Yes.” He asked, “What is their colour? “ He said, “Red.” He asked, “Is there a leaf-coloured one among them?” He said, “Yes, there is a leafy one among them.” He asked, “From where has it come?” The man offered, “Perhaps a vein resembled.” (An earlier one may have had this colour). The Prophet ﷺ explained, “Thus, here too, is a resemblance to a vein (of an ancestor).” (A reversion to a strain). [Bukhari 7314, Muslim 1500] --------------------------------------------------------------------------------