Final answer:
Ichabod Crane whispered to Gunpowder because he didn't want to wake anyone up.
Step-by-step explanation:
Ichabod Crane whispered to Gunpowder because he didn't want to wake anyone up. In the story, Ichabod was trying to escape from someone who was chasing him and didn't want to draw attention to himself. By whispering, he hoped to remain unnoticed and sneak away without alerting anyone.