A short riddle rhyme describing something that fills a hill and a hole yet can never be caught in a bowl. The answer is mist, and it rewards a pause before you give it away.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
A hill full, a hole full,
Yet you cannot catch a bowl full.
About this rhyme
Text matches exactly, two lines, and the title itself gives the answer as mist.
A riddle in two lines: something fills a hill and fills a hole, yet slips straight through a bowl. The answer is mist, there and everywhere, but impossible to hold. Try it as a guessing game before saying the title out loud.
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition