"It is very beautiful to see how the entire Old Testament already appears to us as a history in which God communicates his word: indeed, 'by his covenant with Abraham (cf. Gen 15:18) and, through Moses, with the race of Israel (cf. Ex 24:8),' he gained a people for himself, and to them he revealed himself in words and deeds as the one, living and true God."
(Source: Benedict XVI)