Stolen Bees
It was believed that stolen bees would not make honey, and that the hive which had been stolen would die.
A Swarm Entering a House
Should a swarm enter a house, it was considered unlucky, and usually it was a sign of death to someone living in that house.
The culture of bees was once more common than it is, and therefore they were much observed, and consequently they figure in the folk-lore of most nations.