At that time, when they are scattered, they will perish, and when it becomes hot, they will be freed from their place
Other versions
King James Version
What time they wax warm, they vanish: when it is hot, they are consumed out of their place. English Standard Version
When they melt, they disappear; when it is hot, they vanish from their place.New International Version
but that cease to flow in the dry season, and in the heat vanish from their channels.