In Acts 5, people laid the sick in the streets hoping what would fall on them?

Answer: Peter's shadow

People brought the sick on cots and mats so that at least Peter's shadow might fall on some of them as he passed.

“As a result, people brought the sick into the streets and laid them on cots and mats, so that at least Peter’s shadow might fall on some of them as he passed by.”— Acts 5:15 (BSB)