The most Blessed Virgin Mary was, from the first moment of her conception, by a singular grace and privilege of almighty God and by virtue of the merits of Jesus Christ, Saviour of the human race, preserved immune from all stain of original sin. 135
Catechism number 493
The Fathers of the Eastern tradition call the Mother of God "the
All-Holy" (Panagia), and celebrate her as "free from any stain of
sin, as though fashioned by the Holy Spirit and formed as a new
creature".138 By the grace of God Mary remained free of every
personal sin her whole life long.
"Let it be done to me according to your word. . ."