Answer: Exodus 16:16. This verse describes the gathering of the miraculous manna which fell in the desert: It states: "This is the thing that God commanded: Each person should gather of it as much as he needs to eat, an omer measure per person, according to the number of people each man has in his home." This teaches that whoever fulfills the Torah in its entirety - "from aleph to taf" (the first and last letters in the Hebrew alphabet) - will be assured of his sustenance by God.
