Combine raisins and vinegar in a small microwave-safe bowl; microwave at HIGH 1 minute and 15 seconds or until raisins are plump. Drain raisins in a sieve over a medium bowl, reserving 1 tablespoon vinegar; discard the remaining vinegar.
Combine raisins, celery, and parsley in a large bowl.
Add salt and pepper to reserved vinegar, stirring with a whisk. Gradually add oil, stirring constantly with a whisk. Drizzle dressing over salad; toss gently to coat.