Why is the name of Moshe not mentioned in this parsha?
(28,20) “And you shall command the children of Yisrael and they shall take to you pure olive oil, crushed for lighting, to kindle the lamps continually.”
The various commentaries have already discussed why the name of Moshe Rabbeinu is not mentioned in this parsha, but another reason is that the seventh of Adar always falls in the week of parshas Tetzaveh, (except on the very rare occasions when it falls in the week before this parsha), and Hashem who sees until the end of all the generations knew from the beginning that Moshe Rabbeinu would be removed from this world on the seventh of Adar. Therefore, to allude to this, his name is not mentioned in this parsha.
To which teaching of Chazal does this posuk allude to?
(28,36) “And you shall make a plate of pure gold, and you shall engrave upon it like the engraving of a seal (פתוחי חתם): Holy to Hashem.”
The gemora in Ta’anis teaches that three keys are kept in the hand of Hashem and He does not give them over to an emissary - the key for childbirth (חיה), as it says in Bereishis 30:22 “And Hashem remembered Rachel…and He opened her womb”, the key for rain (מטר), as it says in Devarim 28:12 “and Hashem will open up for you His good treasury, the heaven, to give your land its rain in its time”, and the key for the resurrection of the dead (תחיה), as it says in Yechezkel 37:13 “And you shall know that I am Hashem when I have opened your graves and caused you to come out of your graves”.
Now, it is well known that there nothing which is not alluded to in the Torah, and this teaching is alluded to in our posuk: פתוחי (the keys - מפתחות) of חתם (the initial letters of חיה, תחיה, מטר) are 'קודש לה (holy to Hashem), and not given to anyone else.