Holy Friday

https://www.oca.org/orthodoxy/the-orthodox-faith/worship/the-church-year/holy-friday

Matins of Holy Friday are generally celebrated on Thursday night. The main feature of this service is the reading of twelve selections from the Gospels, all of which are accounts of the passion of Christ. The first of these twelve readings is Jn 13.31–18.1. It is Christ’s long discourse with his apostles that ends with the so-called high priestly prayer. The final gospel tells of the sealing of the tomb and the setting of the watch (Mt 27.62–66).

https://blogs.ancientfaith.com/rethinkingsacrifice/2022/08/02/he-bore-our-sins/

The Orthodox understanding of Christ‘s death for us and our atonement.