For the LORD spake thus to me with a strong hand, and instructed me that I should not walk in the way of this people, saying, With a strong hand "As taking me by the hand" - Eleven MSS., (two ancient), of Kennicott's, thirty-four of De Rossi's, and seven editions, read כחזקת kechezkath; and so Symmachus, the Syriac, and Vulgate. Or rather with a strong hand, that is, with a strong and powerful influence of the prophetic Spirit.
Related Commentaries of Isaiah 8:11
Isaiah 8:11
11 For the LORD spake thus to me with a strong hand, and instructed me that I should not walk in the way of this people, saying,