How much is a tenth of an Eifah?
Rashi: 1 Eifah = 3 Se'ah; 1 1 Se'ah = 6 Kabin; 1 Kav = 4 Lugin; 1 Log = 6 egg-volumes. Consequently, 1 Eifah = 432 egg-volumes; hence a tenth of an Eifah = 43 1/5 egg-volumes -- which is the Shi'ur for taking Chalah 2 and the Shi'ur of Menachos. 3
See Torah Temimah, note 58.
Eruvin 83b: This teaches us that the 'dough in the desert' comprised seven Lugin plus one and a fifth egg-volumes.
Gur Aryeh: Rashi deems this relevant here, because if the Torah tells us the exact amount of a daily portion of Manna, it must be due to the Halachos that we will need to derive from it.
Why does the Torah insert this Pasuk here, beginning with the word "and the Omer"?
Ba'al ha'Turim: To teach us that, after Moshe's death - on the seventh of Adar - they continued to eat the Manna until they brought the Korban ha'Omer, on the sixteenth of Nisan.
