Origin 610 to 1925 CE
Blessing, in the specific sense of a beneficent power that God places in things and that can be transmitted. The Quran uses the root of persons, of places, of a night and of a tree, and the term itself is uncontroversial. What is contested is the practice built on it.
In much of the Muslim world barakah is sought at the tombs of saints, from the descendants of the Prophet, in relics, in food touched by a holy person, and in written amulets. Around this grew the shrine cultures of Morocco, Egypt, Anatolia, the Balkans, South Asia, Central Asia and West Africa, with their annual festivals, custodial families and endowments, an enormous part of lived Islamic practice for a thousand years.
Reformist and Salafi scholarship attacks much of this as shirk or as innovation, holding that seeking benefit from a created thing displaces reliance on God. The attack is not new, running from Ibn Taymiyya in the fourteenth century through the Wahhabi movement in the eighteenth, and it has had physical consequences: shrines and tombs have been demolished in Arabia, Mali, Libya and Iraq on this reasoning within the last two centuries.
Traditionalist Sunni and Shia scholarship replies that seeking blessing through a means God has honoured is not worship of that means, and cites the companions' treatment of the Prophet's hair, water and garments.