Although the Feast title is what it is, the liturgy only captures the purification ritual in one place in the Gospel. The scripture readings tell us of the Presentation of our Lord in the temple, the consecration of the first born son to God, and then the offering of a pair of turtledoves as means of redeeming the child.
The Gospel also tells us of Simeon, a devout Jew who had been promised by the Holy Ghost that he would not die until he had seen the Saviour. That promise of the Holy Ghost is realised at the Presentation as Simeon, who is present, Jesus into his arms and says the words words which we know as the Nunc dimittis (Luke 2:29-32), which is said each evening at Compline:
Nunc dimíttis servum tuum, Dómine, * secúndum verbum tuum in pace:
Quia vidérunt óculi mei * salutáre tuum,
Quod parásti * ante fáciem ómnium populórum,
Lumen ad revelatiónem Géntium, * et glóriam plebis tuæ Israël.
Now thou dost dismiss thy servant, O Lord, * according to thy word in peace;
Because my eyes have seen * thy salvation,
Which thou hast prepared * before the face of all peoples:
A light to the revelation of the Gentiles, * and the glory of thy people Israel.