Baruch 3:12
10 Why is it, O Israel, why is it that you are in the land of your enemies, that you are growing old in a foreign country, that you are defiled with the dead, 11 that you are counted among those in Hades? 12 You have forsaken the fountain of wisdom. 13 If you had walked in the way of God, you would be living in peace forever. 14 Learn where there is wisdom, where there is strength, where there is understanding, so that you may at the same time discern where there is length of days, and life, where there is light for the eyes, and peace.
Athanasius Discourse Against the Arians 18
Therefore, when He made His promise to the saints, He thus spoke; 'I and the Father will come, and make Our abode in him;' and again, 'that, as I and Thou are One, so they may be one in Us.' And the grace given is one, given from the Father in the Son, as Paul writes in every Epistle, 'Grace unto you, and peace from God our Father and the Lord Jesus Christ.' For the light must be with the ray, and the radiance must be contemplated together with its own light. Whence the Jews, as denying the Son as well as they, have not the Father either; for, as having left the 'Fountain of Wisdom,' as Baruch reproaches them, they put from them the Wisdom springing from it, our Lord Jesus Christ (for 'Christ,' says the Apostle, is 'God's power and God's wisdom),' when they said, 'We have no king but Cæsar.' The Jews then have the penal award of their denial; for their city as well as their reasoning came to nought.
Notes and References
"... The figure of Baruch is associated with the Syriac Apocalypse of Baruch (2 Baruch), the Greek Apocalypse of Baruch (3 Baruch), and the Paraleipomena Jeremiou (4 Baruch). Baruch is not mentioned in the New Testament or Apostolic Fathers, even with regard to the incarnate wisdom motif in 3.38 (compare John 1:14; Romans 8:3; Hebrews 2:14), although Baruch does appear in canon lists from the fourth century (Athanasius, Ep. Fest. 39; Cyril of Jerusalem, Cat. 4.35; Epiphanius, Pan. 8.6.1-4). Early Jewish and Christian writings assign Baruch uncertain prophetic status. The Masoretes saw Baruch as Jeremiah’s scribe (e.g., Jeremiah 36:27, 32) and the Byzantine Vitae Prophetarum excludes Baruch. Yet the earliest quotation from Baruch (Athenagorus, Leg. 9) names Baruch as a prophet, and some authority is suggested where Optatus of Milevis appeals to Baruch in a church controversy (Against the Donatists 7.1). With regard to biblical theology, Baruch has received some attention as to the ethical system offered by its exegesis of sin, exile, and repentance (Harrington, Invitation, p. 93; see also Harlow, Greek, p. 168; Wright, Baruch, pp. 113–21) ..."
Ryan, Daniel "Baruch" in Aitken, J. K. (ed.) T&T Clark Companion to the Septuagint (pp. 487-499) T&T Clark International, 2015