Parallel
Isaiah 48:4
Swete's Septuagint · Berean Standard Bible
γινώσκω ἐγὼ ὅτι σκληρὸς εἶ, καὶ νεῦρον σιδηροῦν ὃ τράχηλός σου, καὶ τὸ μέτωπόν σου χαλκοῦν.
For I knew that you are stubborn; your neck is iron and your forehead is bronze.