When the visit ended, the party began the homeward journey, passing through the town of Niezhin. But upon his arrival, the Rebbe fell ill and was unable to continue travelling. The most experienced physicians that could be found were called in, but none could cure the Rebbe.
They ordered complete bed-rest, and even proscribed the Rebbe from delivering his customary talks to his chasidim. This advice was the most bitter for the Rebbe. For the very essence of a Rebbe is to give of himself to his Chasidim. The relationship between Rebbe and chasid is a symbiotic one in which both benefit physically as well as spiritually.
His condition deteriorated steadily, until he finally lapsed into unconsciousness, evincing no apparent life force. The doctors were at a loss, when one of them said to another, "Do you want to see something very strange? If we permit the Rebbe to deliver a discourse to his followers, you will see him regain his vitality."
The scene which followed was truly amazing, as the Rebbe, fully vibrant, sat in his bed and spoke to the Chasidim who crowded the house to hear his words. In the course of the talk, the Rebbe said, "Now I will tell you secrets of the Torah which have never been revealed." But just as he was about to continue, a chasid leaning forward on a bench behind the Rebbe fell. The tumult interrupted the Rebbe's thoughts and he remarked, "It seems that Heaven doesn't wish these things to be revealed."
The Rebbe's condition worsened on the night of the ninth of Kislev to the point that he could not be revived. People flocked to the house to be near the Rebbe. Suddenly the Rebbe sat up in bed, smiling and said, "I heard a voice saying, 'What need has a soul like this for this world?'"
The Rebbe requested that he be dressed in white garments. And then, for the first time since he had been so ill, he delivered a discourse in which he praised the Jewish people for doing mitzvot (commandments) with such devotion. He bade his family and Chasidim to be joyful, for joy breaks through all boundaries and bitterness. Then he continued revealing deep Chasidic philosophy. All those present were overjoyed to see that their Rebbe appeared to have recovered his strength.
The Rebbe then turned to one of his disciples and told him, "While I am speaking, watch out that I don't fall asleep. If I do, just touch me with your hand and I will wake up."
He continued delivering his discourse in a greatly heightened mental state, asking several times whether it was yet dawn. He expounded upon the words, "For with You is the source of life," and when he had finished saying the word "life" his soul left his body.
