Translation:

16. (Their allies deceived them) like the Evil One when he says to man "Deny Allah"; but when (man) denies Allah (the Evil One) says "I am free of thee: I do fear Allah the Lord of the Worlds!"

Notes (Tafseer)

5393. An apt simile. Evil tempts man in all sort of ways, and presents seductive promises and alliances to delude him into the belief that he will be saved from the consequences. Satan says, "Deny Allah": which means not merely denial in words, but denial in acts, disobedience of Allah's Law, deviation from the path of rectitude. When the sinner gets well into the mire, Satan says cynically: "How can I help you against Allah? Don't you see I am afraid of Him? All our alliances and understandings were moonshine. You must bear the consequences of your own folly."