Deuteronomy 19:5
For example, if a man goes into the woods with his neighbour for the purpose of cutting down trees, and when he takes his axe to give a blow to the tree, the head of the axe comes off, and falling on to his neighbour gives him a wound causing his death; then the man may go in flight to one of these towns and be safe:
Numbers 35:25
And let the people keep the man responsible for the death safe from the hands of him who has the right of punishment for blood, and send him back to his safe town where he had gone in flight: there let him be till the death of the high priest who was marked with the holy oil.
2 Kings 6:5-7
But one of them, while cutting a board, let the head of his axe go into the water; and he gave a cry, and said, This is a bad business, my master, for it is another's.
Proverbs 27:12
The sharp man sees the evil and takes cover: the simple go straight on and get into trouble.
Isaiah 32:2
And a man will be as a safe place from the wind, and a cover from the storm; as rivers of water in a dry place, as the shade of a great rock in a waste land.