Emor: Two Short Vorts

Rav Moshe Shmuel Shapiro - The Vilna Gaon's Overflowing Cups 

In the first pasuk of Emor it says twice to tell the Kohanim: Emor and V'Amarta. Rashi quotes the gemara in Yevamos that says the double language is, "L'Hazhir Gedolim Al HaKetanim", to tell the adults to caution the children. 

How do Chazal see this from the fact that is says twice to tell them, asks Rav Moshe Shmuel Shapiro? 

He answers that the Dubno Magid once asked the Vilna Gaon what is the most effective way to influence children. The Vilna Gaon answered with a Mashal. 

He said to take a large cup and surround it with smaller cups. Then pour into the large cup and keep pouring until it spills over the top right into the little cups. To have children absorb the lessons, you must fill yourself with an overdose of whatever traits you want to teach them. They will become filled from the overflow. 

The Kohanim were implored twice, to give them a double measure of Kedushas Kohen. The reason for this is obviously in order for it to spill over to the children.

Preparing Food on Yomtov

 דַּבֵּר אֶל-בְּנֵי יִשְׂרָאֵל וְאָמַרְתָּ אֲלֵהֶם מוֹעֲדֵי יְהוָה אֲשֶׁר-תִּקְרְאוּ אֹתָם מִקְרָאֵי קֹדֶשׁ אֵלֶּה הֵם מוֹעֲדָי שֵׁשֶׁת יָמִים תֵּעָשֶׂה מְלָאכָה וּבַיּוֹם הַשְּׁבִיעִי שַׁבַּת שַׁבָּתוֹן מִקְרָא-קֹדֶשׁ כָּל-מְלָאכָה לֹא תַעֲשׂוּ שַׁבָּת הִוא לַיהוָה בְּכֹל מוֹשְׁבֹתֵיכֶם

Speak to the children of Israel and say to them: The Lord's appointed [holy days] that you shall designate as holy occasions. These are My appointed [holy days]: [For] six days, work may be performed, but on the seventh day, it is a complete rest day, a holy occasion; you shall not perform any work. It is a Sabbath to the Lord in all your dwelling places.   Emor 23:2-3

Why did this Parsha in the first Posuk start talking about Yom Tov and in the next Posuk talk about Shabbos? The Vilna Gaon provides the answer. There are שֵׁשֶׁת יָמִים that are from the Torah but you are allowed to do Melacha for food. The first and last day of Pesach make two days and a third is one day of Shavous, a Fourth is a single day of Rosh Hashanah, and then again two days of Succos adding up to six days that the Torah gave us But then the last Yom Tov is שַׁבַּת שַׁבָּתוֹן Yom Kippur and hence the connection of the two Posukim is explained.

Source: Revach.net