ISB ~ Luke 22 v17

he took a chalice:The Passover meal (Seder) was structured around four cups of wine. Here Jesus takes the first or second cup; either he was sanctifying the feast (cup one) or he and the disciples had just finished singing Ps 113-14 (cup two). The eucharistic cup that Jesus consecrates in 22:20 was probably cup three, the “cup of blessing”, which was drunk after the main meal (1 Cor 10:16).