What happened when the Egyptian magicians threw down their rods?
When the Egyptian magicians threw down their rods, those rods became serpents. But Aaron's rod had already become a serpent, and Aaron's serpent swallowed up the Egyptian serpents. This event serves as a picture that the New Testament will explain, according to the context.
Les explains that as Aaron placed his rod on the ground it became a serpent. The Egyptian magicians threw their rods down and they also became serpents, but Aaron's serpent swallowed up the Egyptian serpents. Les then asks, "Now what's the picture?" and says the New Testament will tell us, turning to 1 Corinthians chapter 15 to reveal the deeper meaning.