The episode of Korach's rebellion teaches us what strenuous efforts one has to make to avoid strife and quarrels. Consider what terrible punishment Korach suffered, and the fact that none of his illustrious forbears' merits saved him from any part of that punishment. Not even the fact that he left behind worthy children, grandchildren, etc, has any effect on his eventual rehabilitation. The same fate happened to Datan and Aviram as well as to their children. Although we have a general rule that the Celestial Court does not judge people below the age of twenty, our sages are on record that in this case even under-age children became the victims of the misdeeds of their parents. From here we have to learn that we must always (endeavor to) hold on to peace. Aaron's behavior in this episode is the most remarkable, seeing that though he had been the principal object of contention, he never uttered a word during the whole episode. A person should try to be guided by whatever reason he can find to maintain peaceful relations and to extinguish the flames of strife. Take a cue from Moses himself, who was the greatest of all the prophets, who occupied the position of king, and who personally went to to Datan and Aviram after the latter had rebelled and had refused to come to him. He took all the elders with him. All of this in the interest of maintaining or restoring peace!

לא חמור אחד מהם נשאתי . The prophet Samuel also made a similar statement when he challenged the people asking "whose donkey have I taken, etc." (Samuel I 22,19)? I have elaborated on the lessons to be learned from theses statements in my commentary on מסכת ראש השנה.

כל חלב יצהר וכל חלב תירוש ודגן . "All the best of the new oil, wine, grain, etc." We have the Torah on record here that he who gives the Priests his dues should give them of the best of his respective produce to show that he wishes to fulfill that commandment sincerely. Similarly, when giving charity, [at a time when the coins in circulation sometimes had worn off and their value was somewhat questionable] he should give only coins which are in mint condition.