few and far between - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
At wide intervals, scarce, as in Supporters of the amendment are few and far between. This expression originally was used very literally for physical objects such as houses appearing at widely separated intervals. Today it is also used more loosely. [Mid-1600s]