[Saba and his wife and baby, Nachman, were living in Jerusalem for 2.5 years. Then Saba went back to Tiberius by himself on a scouting mission to see if it would be possible to move back there with his family.] At the time I went to Tiberius, Nachman got such a case of pneumonia, that one in a thousand can come out of it! There was already nothing that could be done. There was a big doctor, an elderly professor, it was accepted in Jerusalem that he was a malach (an angel), not a doctor. Just a malach! A malach! A malach! (Dr. Wallach?) Dr. Wallach. This is something else, he was a malach. He was more than a doctor. Wallach. He would resurrect the dead! In any case, I saw, there was a pharmacist in Jerusalem, he was a neshama, a big neshama, he had compassion on the sick and she cried before him, "My husband went to Tiberius and I..the child is so ill." So he went and brought this malach to my son (And he healed him?) Yes. Baruch Hashem, he came out of the illness, but the illness was so strong that he suffered all the days of his life from breathing problems, he was already, it was already hopeless and I returned from Tiberius to Jerusalem to get them and she told me, "Do you know? What is this? Nachman, he was resurrected from the dead, he was already dead", yes.
For more about Dr. Moshe Wallach see: http://www.shemayisrael.co.il/publicat/hazon/tzedaka/devout.htm
He was the director of Shaare Zedek Medical Center from when it was founded in 1902 until 1947.
Dr. Wallach's spiritual and halachic guide was Rav Yosef Chaim Sonnenfeld. Saba speaks about Rav Sonnenfeld in a few places in Conversations from the Life of the Saba. Here is one example from pg. 237:
Rav Chaim Sonnenfeld stood up before Rav Shlomo [Wexler] like before a king! Reb Yosef Chaim Sonnenfeld the genius from Jerusalem...(The Rav Chaim Sonnenfeld was a holy man?) The Rav Sonnenfeld? (He was a holy man?) Oh! But he was, he was a Litvak and he saw the books of Rabbainu, he was very frightened, he gave great honor to everyone who drew close to Rabbainu.