'Usual' in the Bible

Now it came about on the next day that an evil spirit from God came mightily upon Saul, and he raved in the midst of the house, while David was playing the harp with his hand, as usual; and a spear was in Saul’s hand.

The king sat on his seat as usual, the seat by the wall; then Jonathan rose up and Abner sat down by Saul’s side, but David’s place was empty.