(4) In the days of Mattisyahu, the son of Yochanan the High Priest, the Hasmonean, and his sons, when the wicked kingdom of Greece rose up against Your people Israel to make them forget Your Torah and to stray from the laws of Your will, You, with great mercy stood by them in the time of their distress. You fought their fight, judged their cause and avenged them with vengence. You delivered the strong into the hands of the weak, the many into the hands of the few, the impure into the hands of the pure, the wicked into the hands of the righteous and the arrogant into the hands of those engaged with Your Torah. For Yourself you made a great and holy name in Your world, You performed a great deliverance for Your people Israel on this day. After these things, Your children entered into the Holy of Holies of Your House, cleansed Your Temple, purified the place of Your Holiness, kindled lights in Your holy courts and established these eight days of Hanukkah to express thanksgiving and praise to Your great name.)

One must give up one's life rather than violate even a minor mitzva - The reason is so that the idolaters will not become accustomed to soften the hearts by [making their decrees]