In Israel, St James Vicariate actively celebrates many biblical saints in their liturgies, notably in the Holy Sacrifice of the Mass.
St James Vicariate celebrates the Feast of the Prophet Elijah on July 20, the Feast of Saint Ezekiel on April 10, the Feast of King David on December 29, the Feast of Moses Giver of the Law on September 4 and the Feast of mother and seven sons who died as martyrs on August 3. There are other biblical saints that St James Vicariate celebrate and may be found here.
Although many biblical figures are indeed saints, though they seem not to be traditionally honored with the title "saint" but with titles such as prophet, king, etc. Notwithstanding, they are nevertheless saints and may be called saints in litanies, etc.
Figures from the Old Testament are never referred to as saints. Were there no saints in those days?
It is true that, in the Catholic Church, Old Testament figures have not been formally canonized and given the title of “saint.” I suspect that this has to do with the historical process by which that title came to be assigned.
In the earliest centuries of the Church, only those who had been martyred for their faith were commemorated liturgically on their anniversaries. St. Martin of Tours, who died in 397, was probably the first non-martyr assigned a feast day. Since then, sainthood has generally been ascribed to people who provided outstanding examples of lives modeled after the teachings of Jesus (which would exclude those who lived before Christ).
Does that mean that we cannot pray to Old Testament figures or seek their intercession? By no means. The word “saint’ is commonly taken to mean someone who followed the will of God and is now in heaven. Surely, Moses and Elijah are safely there, since they appeared with Jesus on Mount Tabor at the Transfiguration.
Catholic Churches of the Eastern rite (Greek or Byzantine, for example) do, in fact, celebrate specific feast days for Old Testament figures: Joshua and Moses, Daniel, the seven Maccabee brothers, etc.
The “Roman Martyrology,” a compilation of those honored as saints, includes such notable Old Testament figures as Isaiah, Abraham, and King David. The Catechism of the Catholic Church also has this to say in No. 61: “The patriarchs, prophets, and certain other Old Testament figures have been and always will be honored as saints in all the Church’s liturgical traditions.”
So the great figures of the Old Testament, though never formally canonized by the Latin-rite Church, are worthy of our devotion and our imitation. - Were there no saints in the Old Testament?