On this date, Rabbi Schneur Zalman of Liadi, who supported and aided the Czar's army during the Napoleonic wars, was forced to flee his hometown from Napoleon's forces which were advancing through White Russia in their push toward Moscow. After five months of wanderings he arrived in the town of Pyena. There he fell ill and, weakened by the tribulations of his flight and the harsh Russian winter, passed away on the 24th of Tevet, 5573 (1812).
Links: The Rebbe vs Napoleon
R. Eliezer Zusia Portugal (1898–1982), the Skulener Rebbe, is best known for his superhuman efforts to rescue Jewish orphans and refugees in Eastern Europe before, during, and after World War II and his continuing support of them. He immigrated to the United States in 1960, after imprisonment in Rumania and international efforts to secure his release. He was renowned for his lengthy prayers and the beautiful tunes he composed.
Noah was a tzadik, a very great man. He saved the entire world. But he didn't approach Abraham's greatness.
When G‑d told Noah to build an ark before the world would be destroyed, Noah built an ark.
But when G‑d told Abraham He was about to destroy the cities of Sodom and Gomorrah—cities corrupt and evil to the core—Abraham argued. He said, “Perhaps there are righteous people there! Will the Judge of All the Earth not do justice?”
Where Noah donned a warm coat for himself and his family, Abraham built a warm fire for the entire world.
Because Abraham felt a sense of ownership for the world in which he lived. If there was something wrong, it needed to be changed. Even if it had been decreed by the will of G‑d.