Sefer hazikaron relates that when the Previous Lubavitcher Rebbe met with the Sfas emes, the Sfas emes took the previous Rebbes hand and said “Ah! A holy hand!”.
The hidden tzaddik Reb Slomke of Zvhill said “Its proclaimed in heaven “Rebbe Rayatz[Previous Lubavitcher Rebbe] Tzaddik HaDor!”