CCC 281

And so the readings of the Easter Vigil, the celebration of the new creation in Christ, begin with the creation account; likewise in the Byzantine liturgy, the account of creation always constitutes the first reading at the vigils of the great feasts of the Lord. According to ancient witnesses the instruction of catechumens for Baptism followed the same itinerary.¹¹⁹ Cf. Egeria, Peregrinatio at loca sancta 46: PLS 1, 1047; St. Augustine, De catechizantis rudibus 3, 5: PL 40, 256PL — Patrologia Latina (Migne).