emor

The posuk says אמר אל הכהנם ואמרת - say to the Kohanim & say to them.
Rashi says it uses the double lashon to warn the adults about their children.
Asks ר' משה פינשטיין, how do we understand this for the ואמרת isn't only talking about kids, it's directed to adults too?
The posuk says והקרבתם מנחה חדשה לה; The Torah commands us to bring a korban mincha from the new crop.
The כלי יקר says that here the Torah hints that חג השבועות is the day of the giving of the Torah, for the Torah has to be like new for you just like it was the day we received it from Har Sinai.
He goes on to explain the reason it doesn't. say straight out what day the Torah was given, for 'ה wanted a person to think that every day is the day that we got the Torah & to find something new in it each day to keep it exciting & not just the same old thing over & over.
Like the בעל החינוך says, the reason we count up to Shavuos & not start from 50 & count down like one would normally do, is to show our anticipation to get to the day of קבלת התורה. Therefore, we don't want to put a big number up front for that would dampen our spirits, so we start from one and work our way up.
Similarly says R' Moshe, when we want to teach our children, it's not enough to tell them to do the mitzvos even if we do them ourselves. The only way to teach them to do the mitzvos is if we instill in them a love for torah & mitzvos, teaching them that it's our lifeline. When there's a love for torah it will be easy for the children to carry on the tradition & do the mitzvos, so that's why we need the double lashon. Once for the actual command, & once to give them the love for mitzvos.
From here we see how important it is not to do mitzvos by rote, & to treat each time we do a mitzva like it's the first time, to have a contagious excitement in our avodas 'ה that our children will feel & want to emulate!