But let no one, hearing that the Lord had sworn to Abraham, be tempted to swear. For as when the wrath of God is spoken of, it does not signify passion but punishment; so neither dos God swear as man, but His word is in very truth expressed to us in place of an oath, confirming by an unchangeable sentence what He promised.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Hom. in Ps. 29. et in Ps. 14. App. op.