'Knowledge' in the Bible

for the fleeing thither of a man-slayer smiting life inadvertently, without knowledge; and they have been to you for a refuge from the redeemer of blood.

'And when the redeemer of blood doth pursue after him, then they do not shut up the man-slayer into his hand, for without knowledge he hath smitten his neighbour, and is not hating him hitherto;