Kevin Durant's Rabbi -- THANK GOD THE BLESSING WORKED ... I Didn't Wanna Be Embarrassed!

One of the 3 rabbis who blessed Kevin Durant before Game 6 says he begged God for the OKC star to have a great game ... because he didn't wanna be embarrassed if the blessing didn't work!

We spoke with Rabbi Illulian -- one-third of the "Triple Rabbi Blessing" Durant received at the Jewish Education Movement center in L.A. just hours before the Thunder took on the Clippers.

"I really prayed and I made a spiritual contact with my heart to Kevin," the Rabbi says.

But this is the best part -- "When I heard that [The Thunder] were losing by 16 points, I was a little disappointed ... I said, 'Hey God, don't embarrass me today!"

God came through. Kevin came through. Everyone was happy!

Except the Clippers.