'Bolster' in the Bible

Not good is this thing which thou hast done; Jehovah liveth, but ye are sons of death, in that ye have not watched over your lord, over the anointed of Jehovah; and now, see where the king's spear is, and the cruse of water which is at his bolster.'

and he looketh attentively, and lo, at his bolster a cake baken on burning stones, and a dish of water, and he eateth, and drinketh, and turneth, and lieth down.