According to Roman Catholic doctrine, saints are those now in heaven because of their exemplary lives, who can make intercession with God for the living as well as for those in purgatory.* The practice of the veneration of saints claims biblical foundation, e.g., Genesis 18:16-31; Matthew 19:28; Hebrews 12:1; Revelation 6:9f.; see also Paul's doctrine of Christ's mystical body, with all members as “fellow-citizens with the saints, and of the household of God” (Eph. 2:19). The nonbiblical sources for the practice range through Christian history, beginning in the pre-Nicene period with the [[Odes of Solomon]] and the Martyrium Polycarpi (c.156). Origen* was probably the first of the Fathers to permit the cult of martyrs a theological claim, and Cyril* and Chrysostom* made the distinction between those commemorated at the Eucharist and the ordinary dead.