I didn’t. I believe verses 5 and 8 just fine. The poor as mentioned in verse 5 will be kept forever. It is the promise of God’s words that you are reading about this tells you so. Without these words of the Lord being preserved for us today, you wouldn’t know. Both God’s words and his people will be preserved.
God’s Word says His words will be preserved forever (Psalms 12:6-7) (Isaiah 40:8) (1 Peter 1:23-25) (Also compare John 17:17 with Psalms 100:5 and Psalms 117:2). In fact, scrolls of Scripture were written on either vellum (flesh/animal skins) or papyri (i.e., grass). The scribes knew they had to keep making copies to preserve God’s words because the scrolls of the Scriptures would get old and decay and perish. So the flesh of the animal skins and the grass used to write Scripture would eventually pass away. Peter says, “For all flesh is as grass, and all the glory of man as the flower of grass. The grass withereth, and the flower thereof falleth away: But the word of the Lord endureth for ever…” (1 Peter 1:24-25). So even though old copies would die out, new ones would replace them, preserving the words of the Lord forever. In fact, Jesus says, “Heaven and earth shall pass away, but my words shall not pass away.” (Matthew 24:35).