Ajahn Moneyyo discusses the very first Sutta in Suttanipāta: "The Snake" / "Uragasutta".

Snakes regularly have to shed their old skin, as it becomes too restrictive for their growing body. In the wilderness, one can sometimes find this old, worn out skin, left behind by the snake. The Buddha uses this process as a simile for a monk who abandons anger, desire and delusion, leaving all mental defilements behind, just like the snake leaves behind it's old skin. Naturally, abandoning defilements is no easy task, just as he snake has to struggle quite a bit to wriggle out of the old skin. But it is possible, it can be done.

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