What is Ash Wednesday? According to the canonical gospels of Matthew, Mark and Luke, Jesus Christ spent 40 days fasting in the desert, where he endured temptation by Satan. Lent originated as a mirroring of this, fasting 40 days as preparation for Easter. Every Sunday was seen as a commemoration of the Sunday of Christ's resurrection and so as a feast day on which fasting was inappropriate. Accordingly, Christians fasted from Monday to Saturday (6 days) during 6 weeks and from Wednesday to Saturday (4 days) in the preceding week, thus making up the number of 40 days.
Ashes were used in ancient times to express grief. When Tamar was raped by her half-brother, "she sprinkled ashes on her head, tore her robe, and with her face buried in her hands went away crying" (2 Samuel 13:19). The gesture was also used to express sorrow for sins and faults. In Job 42:3–6, Job says to God: "I have heard of thee by the hearing of the ear: but now mine eye seeth thee. Wherefore I abhor myself, and repent in dust and ashes." The prophet Jeremiah calls for repentance by saying: "O daughter of my people, gird on sackcloth, roll in the ashes" (Jer 6:26). The prophet Daniel recounted pleading to God: "I turned to the Lord God, pleading in earnest prayer, with fasting, sackcloth and ashes" (Daniel 9:3). Just prior to the New Testament period, the rebels fighting for Jewish independence, the Maccabees, prepared for battle using ashes: "That day they fasted and wore sackcloth; they sprinkled ashes on their heads and tore their clothes" (1 Maccabees 3:47; see also 4:39).