חסידות אויף ישעיהו 40:6

In the haftarah ('Comfort, comfort My people') it says (Isaiah.40.6-8), "What shall I proclaim? All flesh is grass." The Sages teach (Perek Shirah 1.49) that the fly declares this when Jews are not occupied with Torah. And the response: "Grass withers, flowers fade, but the word of our God stands forever!" For no sin can extinguish Torah.