Christian Lent always begins with Ash Wednesday and ends with Palm Sunday, which opens the door to Holy Week.
It is a 40-day journey of fasting, prayer, meditation and sharing, in memory of the 40 days Christ spent in the desert, under the influence of the Holy Spirit (Mk 1:12-13, Mt 4:1-1, Lk 4:1-13).
This retreat of Jesus into the desert echoes the 40 days and 40 nights of Moses on Mount Sinai where he received the two tablets of the Law (Ex 24:18), his fasting of 40 days and 40 nights to intercede for Israel who had sinned gravely in making and worshipping the golden calf (Deut 9:18. 25), to the 40 years of wandering of the Hebrews in the desert (between Egypt and the Promised Land; Ex 24:18) and finally to the 40 days of the prophet Elijah’s walk to meet God on Mount Horeb (1Ki 19:8).