"And you will command the Children of Israel" [Tetzaveh 27:20]
The Vilna Gaon asks why the verse begins with Hashem instructing Moshe "And you will command..." without first stating the standard opening "Hashem spoke to Moshe, saying..."
The answer, said the Gaon, is as follows:
The day of Moshe Rabbeinu's passing [and day of his birth] was the seventh of Adar. In most years, this day falls out during the week in which Parshas Tetzaveh is read. Now, in the entire Parshas Tetzaveh, Moshe's name is not mentioned, even once. This alludes to the fact that Moshe's demise took place during this week.
However, continued the Gaon, even though Moshe's name is not mentioned explicitly in Tetzaveh, it is nevertheless there in a hint:
There are 101 verses in the Parsha. If the letters that comprise the name "Moshe" - משׁה -are spelled out in their entirety, we would have the following:
מ the letters comprising Mem are מ מ -
שׁ the letters comprising Shin are שׁ י ן -
ה the letters compring Hey are ה א -
Total numerical value: 446
If we add up the numerical value of all these letters, and then subtract the numerical value of משׁה [Moshe: 345] - we will be left with the number 101 - the exact number of verses in the parsha.
Source: Rabbi Y. Bronstein