The instruction to recall is an encouragement to remember. Peter thus assumes that those who receive his letter will already be familiar with the fundamentals of the Christian faith (2 Peter 3:1; 2 Peter 1:12), including OT revelation which was considered authoritative for theology and life (1 Peter 1:10–11; Romans 15:4).1
1 This is now the second letter that I am writing to you, beloved. In both of them I am stirring up your sincere mind by way of reminder,