Why, when God commanded the man to eat of every tree within the Paradise, he speaks in the singular number, and says, "Thou shalt eat;" but when he commands that he shall abstain from the tree which would give him the knowledge of good and evil, he speaks in the plural number, and says, "Ye shall not eat of it, for in the day in which ye eat of it ye shall surely die?" (Genesis 2:16).
Why God Switched from Thou to Ye About the Forbidden Fruit
The Midrash of Philo 16:1