From MLB.com:

Johnny Sain, a three-time All-Star who teamed with Warren Spahn to make up one of baseball's most fabled pitching tandems, died Tuesday. He was 89.

Sain's best year was 1948, when he and Hall of Famer Spahn led the Boston Braves to the World Series, which they lost to Cleveland. It was during that season when the famous saying was born: "Spahn and Sain and pray for rain."

Sain spent around 4 seasons with the Yankees, pitching in 130 games, going 33-20 with a 3.31 ERA. The Yankees acquired him on August 29, 1951 for Lew Burdette and $50,000. And then traded him on May 11, 1955 along with Enos Slaughter for Sonny Dixon and cash.