The plural logia, translated as oracles,
does not mean just words,
but also (stories about) events.
Paul is speaking very broadly here. He does not restrict himself in his wording to the Scriptures,
or the law.
Consequently, his language can be regarded as also including a reference to the appearance of John the Baptist and of Jesus himself. God has spoken to Israel in the first place through the prophets and through his Son. For Paul, God’s Word as spoken through the early prophets forms a unified whole with God’s Word spoken through John the Baptist and through Jesus of Nazareth (see his address in Pisidian Antioch, Acts 13:17–41).1
2 Il est grand de toute manière, et tout d'abord en ce que les oracles de Dieu leur ont été confiés.