Ash Wednesday marks the beginning of Lent — the forty-day season of penitence, fasting, and prayer in preparation for Easter. The forty days (not counting Sundays, which are never fast days) recall Christ's forty-day fast in the wilderness (Matthew 4:1–2, Luke 4:1–2), as well as the forty days of Moses on Sinai (Exodus 34:28) and Elijah's journey to Horeb (1 Kings 19:8). The Lenten fast itself is ancient: the Council of Nicaea (325, Canon 5) references a pre-Easter penitential period as an already-established institution, and by the late fourth century a forty-day fast before Easter was observed across both East and West, though the method of counting varied. The specific association of the fast's opening day with ashes developed in the Western church. The use of ashes as a sign of penitence is deeply rooted in the Old Testament: Job repented 'in dust and ashes' (Job 42:6), Mordecai covered himself in sackcloth and ashes (Esther 4:1), and Daniel prayed 'with fasting and sackcloth and ashes' (Daniel 9:3). The prophet Joel's call — 'rend your hearts and not your garments' (Joel 2:13) — is the appointed Old Testament reading for the day and its theological keynote. The imposition of ashes on the heads of public penitents is attested in the Roman Rite from the seventh century. The Gelasian Sacramentary includes prayers for the penitential rite at the start of Lent, and the practice of marking penitents with ashes before their exclusion from the congregation during Lent is documented in Carolingian sources. By the tenth or eleventh century, the rite was extended from public penitents to the whole congregation — a development that reflects the Lenten theology of universal need for repentance. The words spoken at imposition, 'Remember that you are dust, and to dust you shall return' (Genesis 3:19), connect Ash Wednesday to the deepest stratum of biblical anthropology: the mortality that entered through the Fall and the dust from which humanity was fashioned.

The Ash Wednesday liturgy carries a remarkable pastoral directness. The BCP 2019 opens with an 'Invitation to a Holy Lent' that recounts the early Church's Lenten practices — preparation of catechumens for baptism and reconciliation of notorious sinners — and then applies them to the whole congregation: 'I invite you, therefore, in the name of the Church, to the observance of a holy Lent.' The imposition of ashes is understood as occurring in the same sign as baptism: the forehead marked with ash in the shape of the Cross echoes the baptismal signing, but now with the dust of mortality rather than the water of new life. The BCP's introductory essay makes this connection explicit. The day is, with Good Friday, one of only two days the BCP appoints for total abstinence and fasting — a distinction that underscores its severity. The Litany of Penitence, a corporate confession expanding on the General Confession, is proper to Ash Wednesday and draws the congregation into specific acknowledgment of sin under multiple categories. The tradition of 'giving up something for Lent' — now often accompanied by 'taking on' a discipline of prayer or service — descends from the ancient Lenten fast, though in significantly softened form. The Eastern churches begin their Great Lent on Clean Monday rather than Wednesday, and do not practice the imposition of ashes, making Ash Wednesday a distinctly Western observance. The Anglican tradition inherited it at the Reformation: the 1549 BCP included a 'Commination against Sinners' for Ash Wednesday that was gradually softened in later editions, and the imposition of ashes, dropped in 1552, was restored in the twentieth century and is now standard in ACNA practice. The custom of burning the previous year's palm branches to produce the ashes — well established by the medieval period — creates a beautiful liturgical cycle linking Palm Sunday and Ash Wednesday.

Acts 1:15–26 provides the sole canonical account of Matthias. When the disciples gathered in Jerusalem before Pentecost to fill Judas's vacant place among the Twelve, Peter stood up and explained the need: one of the original band who had been with Jesus 'from the baptism of John until the day [Jesus] was taken up from us' must become 'a witness with us to his resurrection' (1:21–22). Apostolic office, in Peter's formulation, required both continuity with the earthly ministry and testimony to the risen Lord.

Two candidates met this criterion: Joseph Barsabbas (also called Justus) and Matthias. The assembled disciples prayed: 'Lord, you know the hearts of all; show which one of these two you have chosen to take the place in this ministry and apostleship from which Judas turned aside to go to his own place' (1:24–25). Then 'they cast lots for them, and the lot fell on Matthias; and he was added to the eleven apostles' (1:26).

The casting of lots was an ancient biblical practice for discerning God's will (Proverbs 16:33: 'The lot is cast into the lap, but its every decision is from the Lord'). The custom continued in Israel (Joshua 18:8–10; 1 Samuel 14:41–42) and was practiced in the early Church for serious decisions. Notably, after Pentecost and the descent of the Holy Spirit, the early Church never again employs lot-casting; the guidance of the Spirit superseded the older method.

Matthias is not mentioned again in the New Testament. He is listed among the apostles in Acts 1:13, but beyond this, canonical sources are silent. This silence contrasts sharply with the apostles who received post-canonical traditions (Peter, Paul, John, James the Elder, Thomas, etc.). Matthias remains singularly obscure.

Traditionally, Matthias preached the Gospel in Judea before being martyred. Various later sources offer differing accounts of his death: some state he was stoned by Jews, others claim he was beheaded, and still others place his martyrdom in Ethiopia or along the Caspian coast. His relics were claimed by several locations, most notably Trier in Germany, where the Abbey of St. Matthias (allegedly the only apostolic tomb north of the Alps) became a medieval pilgrimage destination. A 'Gospel of Matthias' is mentioned by Origen and Eusebius but does not survive. Some later traditions conflate Matthias with Zacchaeus or with other figures.