Q hypothesis: In the early 1800, Friedrich Schleiermacher championed this hypothetical symbol Q which stands for German Quelle, meaning “source” in order to designate the hypothetical document that Matthew and Luke might have used as their source while writing their Gospels. This hypothetic source would account as the missing document or materials which were considered to be the exclusive sayings of Jesus that are only found in Matthew and Luke; not found in Mark. So, it suggests that they might have shared that particular source with each other.  This hypothesis is not widely accepted as Markan priority by the scholars; yet it is fairly supported by some.