Psalm 34:9-10:

O fear the LORD, ye his saints: for there is no want to them that fear him.
The young lions do lack, and suffer hunger: but they that seek the LORD shall not want any good thing.

Notes on Psalm 34:9-10:

Can you describe yourself as not wanting any good thing when you are sweating and sneezing and coughing in your bed, taking medicine to partially relieve your symptoms?  No, you would want a good thing – healing!

Notice that as with other such verses, this is a conditional promise.  If you just live any old way and don’t care about God much, He hasn’t promised you anything in these verses.  Having no lack is promised only to the man who seeks God.

See also:

Healing Is a Good Thing