Compare Judith 8:26 and Clement of Rome, 1 Clement 31:2

"... Given the necessity of finding something praiseworthy concerning Isaac in the story, an interpreter might still come up with an indication, no matter how slight, that Isaac had consented to be sacrificed. And slight indication there was. After all, the text makes no mention of Isaac resisting or trying to flee. It simply says: 'When they came to the place of which God had told him, Abraham built an altar there, and laid the wood in order, and bound Isaac his son, and laid him on the altar upon the wood' (Genesis 22:9). Is not this silence eloquent? After all, Abraham is an old man—well over a hundred, his age at Isaac's birth (Genesis 21:5). We do not know how old Isaac is, but he is certainly old enough to ask the question that he asks about the sacrificial lamb, and old enough to carry the wood and the fire. Conceivably, then, such a boy or young man could not have been tied up by his aged father if he himself had struggled or attempted to flee. Thus, if Abraham was indeed able to go ahead as planned and offer Isaac as a sacrifice, could it have been in any way other than with Isaac's active cooperation? A number of sources go out of their way to suggest that Isaac was indeed a willing participant ..."