Gregory the Dialogist

He shall deliver thee in six troubles, yea, in seven there shall no evil touch thee. For what is denoted by the number 'six,' which is followed by 'the seventh,' saving the labour and course of the present life? For God, finishing all things on the sixth day, created man, and God rested on the seventh day; and this same seventh day is without an evening, for there is no longer any end to close the rest that followeth. …

Morals on the Book of Job, Book VI ↗

Thomas Aquinas

Eliphaz, then, did not maintain that he was blessed who is corrected by God because of the afterlife because he did not believe in it, but because of the present life during which man obtains immunity from evils and abundance of goods after the correction. Consequently, he next speaks about the immunity from evil, "He will deliver you from six troubles; in the seventh no evil shall touch you." Since all time is represented in seven days, a whole is commonly designated by the number seven. …

Commentary on Job ↗