Kierkegaard's Fear and Trembling - The Trial of Abraham.
The question implied in the parable of Abraham seems to be one of practical ethics as opposed to the less clear rules and requirements of faith, a concept seen as largely aesthetic, as opposed to ethical, by Kierkegaard and one that was also problematic, at large, to he and his contemporaries. Kierkegaard comments that he cannot explain Abraham's position accurately and that he did not become the person he was by way of sin as this was often understood by the ancients to bring understanding and eventual privilege when overcome, at great personal cost. Instead, Abraham presents to Kierkegaard a righteous man who nonetheless, reached a quandary in which he was called upon to prove his faith without doubt. (III-99). 3 pgs. 1 source.
