The Mitzvah of Parah Adumah is the most illogical Mitzvah in the Torah. Yet the Possuk and Rashi seem to provide the reason and the incentive for the Mitzvah. Rashi even adds an explanation of the significance of many of its details.

Why did Hashem distracted the Angel of Death during the giving of the Torah?

Sources:

Bamidbar Perek 19 Pesukim 1 - 22

Commentery of Rashi on Possuk 2 and 22

Commentery of Kli Yakar on Possuk 2. ‘V’Inyan Amok Zeh…’

Gemara Kesubos 103 B

Commentery of Tosafos on the Gemara ‘Oisoi Hayom Shemeis’

Gemara Shabbos 89 A

Commentary of Tosafos ‘Torah Heichan Hee’

Likkutei Sichos Volume 6 pages 84 - 85