'Chance' in the Bible

And the young man said, I came by chance to Mount Gilboa, and I saw Saul supporting himself on his spear; and the war-carriages and horsemen overtook him.

Now by chance there was present a good-for-nothing person named Sheba, the son of Bichri, a Benjamite: and he, sounding the horn, said, We have no part in David, or any interest in the son of Jesse: let every man go to his tent, O Israel.