Matthew 24:12
"And because iniquity shall abound, the love of many shall wax cold."
Cross References (ranked by relevance)
Revelation 3:15
13
I know thy works, that thou art neither cold nor hot: I would thou wert cold or hot.
Revelation 2:10
Fear none of those things which thou shalt suffer: behold, the devil shall cast some of you into prison, that ye may be tried; and ye shall have tribulation ten days: be thou faithful unto death, and I will give thee a crown of life.