The weeks before Easter are usually called “Passiontide” in the modern Lutheran church, though Bach would have known them as “Fastenzeit” (“fasting-tide;” the English word “Lent” is cognate with an archaic German word for “spring”); the weeks between Easter itself and Whitsun are known as “Eastertide.” The three pre-Lent Sundays – known as “Septuagesima,” “Sexagesima,” and “Quinquagesima” – give a not-quite-accurate countdown towards Easter. In the Catholic rite, they count as the first Sundays in the Easter cycle. Lent, which begins on Ash Wednesday in the week following Quinquagesima, comprises the last four days of that week and six more complete weeks. The last of these is Holy Week, which begins on Palm Sunday and ends with Good Friday and Easter Saturday. Lent is, thus, a time for meditation and preparation. In the early church it was, above all, the time for new converts to Christianity to prepare themselves for baptism at Easter, and it is for that reason that the Gospels for the Sundays within the period refer only indirectly, if at all, to Christ’s passion until Palm Sunday.
Lent is no longer the “quiet” time it used to be but, even today, tokens remain, such as the practice of not singing “allelulas,” as a rule. In Leipzig, in Bach’s day – again, differing from Weimar, as at Advent – cantatas were not sung in the Mass from the first Sunday in Lent to Palm Sunday, inclusive. The singing of passions during Holy Week, on the other hand, was a custom of great antiquity. The only cantatas Bach wrote for Sundays in Lent, therefore, date from this time in Weimar: “Alles, was von Gott geboren,” written for the third Sunday, was later, in Leipzig, incorporated in the cantata “Ein feste Burg ist unser Gott;” “Himmelskonig, sei willkommen,” for Palm Sunday, was composed in 1714 as the first work in which Bach, newly appointed concertmaster in the ducal chapel, took up his duty of writing a new cantata every month…
From: a booklet note by Walter Blankenburg (translated from the German by Mary Whittall) accompanying a boxed set of Bach cantatas for Easter by soloists, the Munich Bach Choir, and the Munich Bach Orchestra, all conducted by the late Karl Richter (recorded in the late 1960s and early 1970s).