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In page Super Bowl V:

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On the second play of this potential game-winning drive, Dallas committed a 15-yard holding penalty (its second offensive holding of the game) on the 42-yard line, which was a spot foul, pushing the team all the way back to its own 27-yard line (the NFL did not reduce the penalty for offensive holding to 10 yards until 1974).[5] Then, on second down and 35, Morton threw a pass that slipped through the hands of running back Dan Reeves and bounced for an interception into the arms of linebacker Mike Curtis, who then returned the ball 13 yards to the Cowboys' 28-yard line.