The people of Israel, including King Jeconiah, responded to Baruch's book with repentance, weeping, fasting, and prayer, acknowledging their sins and asking for forgiveness. They sent money to Jerusalem to buy offerings and return the temple vessels, and prayed for King Nebuchadnezzar and his son, as well as for their own forgiveness, recognizing God's justice in punishing them for their disobedience and seeking mercy and deliverance.