On the 13th of Tammuz of 1927, the sixth Lubavitcher Rebbe, Rabbi Yosef Yitzchak Schneersohn, received the documents authorizing his release from a sentence of exile to Kastroma in the interior of Russia. The Rebbe was actually notified of his release on Tammuz 12, but since that day was a legal holiday, the Certificate of Release freeing him to travel home was issued only the next day. Thus both the 12th and 13th of Tammuz are celebrated as a "festival of liberation" by the Chabad-Lubavitch community. (For more on the Rebbe's arrest and liberation, "Today in Jewish History" for yesterday, Tammuz 12).
In Chabad practice, Tachanun (confession of sins) and similar prayers are omitted today.
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.