Charles Ellicott Commentary 1 Samuel 17:16

"And the Philistine drew near morning and evening, and presented himself forty days." — 1 Samuel 17:16 (ASV)

And presented himself forty days. —Wordsworth, following Augustine, sees here a reference to the temptation of the true David, who “was in the wilderness forty days, tempted of the devil.” “In David is Christ ... do not, therefore, read this history of David as if it did not concern you who are members of Christ” (Augustine,Psalms 143:0).