Siman 79

(20.) The Torah "The days of Chanuka are days of thanksgiving — the aspect of the thanksgiving offering" etc. (Likutay Moharan, vol. 2, Torah 2) was said on the Sabbath of Chanuka, and that same year he came from Lemberg. And it is my humble understanding that through this he drew down the aspect of the rectification of the thanksgiving offering [korban todah] — which he needed to bring for having returned safely to his home from there. For this was a great and wondrous salvation for us and for all Israel — for if he had remained there in Lemberg, it is possible that the light would have entirely departed, G-d forbid, and we would not have heard all the awesome things he later revealed to us in his Torahs and conversations that he said afterwards. Particularly the Legendary Tales — for the main great Tales he revealed to us afterwards, particularly the story of the Seven Beggars. And certainly it was fitting to bring a thanksgiving offering for such a salvation. Also several times after he came from Lemberg, we heard from him o.b.m. that he gave great praise and thanksgiving to Hashem Yisburach for having returned from there. And during the walk, each time he came to some place he had been before his journey there, he would say that it was fitting to praise Hashem Yisburach: "He has returned and brought me here again to these places — for I had thought, G-d forbid, that I would never see them again."