In this Torah portion, after yet another eruption of discontent in which the people “speak against G d and Moses,” they were attacked by venomous snakes. When they repented, G-d instructed Moses to place a copper serpent upon a pole, and all who would gaze upon it would be healed.
(Incidentally, this is a possible source for the snake on a stick medical symbol).
How does gazing at a snake bring healing?
Rashi asks this question and explains “When Israel looked heavenward [toward the raised copper serpent] and subjected their hearts to their Father in heaven, they would be healed.”
-Adapted from Daily Lightpoints and Chabad.org