In the Name of Mordechai
Because Esther reported the plot in Mordechai's name, the deed was remembered, and the redemption came through it.
When Mordechai uncovered the plot of Bigsan and Seresh, he told Esther, and she brought the warning to the king. The Megillah takes care to add that she told the king in Mordechai's name. Chazal draw a lasting lesson from this: whoever repeats something in the name of the person who said it brings redemption to the world. Her honesty seemed a small thing at the time. But the deed was written in the king's chronicles under Mordechai's name, and on the sleepless night when the king had the chronicles read to him, it was that entry which led to Mordechai's honor and to the downfall of Haman.
Source: Gemara, Megillah 15a (on Esther 2:22)
Today, when you share a good idea, a vort, a tip or a solution, say where you got it: My friend taught me this, or I heard this from my Rav. At work, mention by name the colleague whose suggestion helped. At home, tell your spouse in front of the children which good thing was his or her idea. It costs you a moment of credit, and Chazal teach that it brings redemption into the world.