21-23. (a) With whom did Isaiah’s prophecy find a first-century fulfillment, and how? (b) Who was the “holy seed” in the first century, and how was it preserved?

²¹ Isaiah’s prophetic task foreshadowed the work that the Messiah, Jesus Christ, would do some 800 years later. (Isaiah 8:18; 61:1, 2; Luke 4:16-21; Hebrews 2:13, 14) Although greater than Isaiah, Jesus was just as willing to be sent by his heavenly Father, saying: “Look! I am come to do your will.”​—Hebrews 10:5-9; Psalm 40:6-8.

25. What have modern-day Witnesses of God discerned, and how do they respond?

²⁵ Similarly, Jehovah’s Witnesses today discern that Jehovah God is in his holy temple. (Malachi 3:1) Like Isaiah, they say: “Here I am! Send me.” Zealously, they sound the warning message about the approaching end of this wicked system of things.