have a heart 

Phrase used to tell someone to care or be sympathetic.

Boy 1: Whatever, forget the guy. Let's go.

Boy 2: Have a heart!

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" Have a heart, sixteen six six six and I know the part."

have a heart by Sleigh Bells October 31, 2014

have a heart of gold 

to be kind, caring and free of malice

His boss turned out to have a heart of gold in the end.

have a heart of gold by The Return of Light Joker February 14, 2009