אֲבָנִ֤ים ׀ שָׁ֥חֲקוּ מַ֗יִם תִּשְׁטֹֽף־סְפִיחֶ֥יהָ עֲפַר־אָ֑רֶץ וְתִקְוַ֖ת אֱנ֣וֹשׁ הֶאֱבַֽדְתָּ׃
Воды носят камни; Их переливы смывают пыль с земли; Так Ты уничтожаешь надежду человека.
Rashi
Stones which the water eroded by constantly passing over them.
Rashi
it washes away i.e., the flood. its aftergrowth of the stone, to be transformed into dust so that something should grow in it. As the aftergrowths of the harvest grow, so will the aftergrowths of this earth be transformed to stone.
Rashi
but the hope of man is not so, because as soon as he dies, it is lost forever.