ON SHABBOS I RETOLD THIS STORY - ABSOLUTELY MIND BLOWING STORY and then some, and promised the source: Here it is:
http://www.chabad.org/…/Details-of-the-Rebbes-Rabbinical-Or…
Appendix: you need to know who the Sridei Eish was to understand the depth and profundity of this story.
1)
https://en.wikipedia.org/wiki/Yechiel_Yaakov_Weinberg
2)
http://www.inn.co.il/News/News.aspx/313945