Parallel
Hebrews 6:13
Robinson-Pierpont Byzantine Textform · Berean Standard Bible
Τῷ γὰρ Ἀβραὰμ ἐπαγγειλάμενος ὁ θεός, ἐπεὶ κατ’ οὐδενὸς εἶχεν μείζονος ὀμόσαι, ὤμοσεν καθ’ ἑαυτοῦ,
When God made His promise to Abraham, since He had no one greater to swear by, He swore by Himself,