וְאַדִּ֣רֵיהֶ֔ם שָׁלְח֥וּ צעוריהם [צְעִירֵיהֶ֖ם] לַמָּ֑יִם בָּ֣אוּ עַל־גֵּבִ֞ים לֹא־מָ֣צְאוּ מַ֗יִם שָׁ֤בוּ כְלֵיהֶם֙ רֵיקָ֔ם בֹּ֥שׁוּ וְהָכְלְמ֖וּ וְחָפ֥וּ רֹאשָֽׁם׃
And their nobles send their lads for water: They come to the pits, and find no water; Their vessels return empty; They are ashamed and confounded, and cover their heads.
Rashi on Jeremiah
their vessels have returned empty for no rain has fallen.