Adam Clarke on Exodus 11:1

The Lord said unto Moses - Calmet contends that this should be read in the preterpluperfect tense, for the Lord Had said to Moses, as the fourth, fifth, sixth, seventh, and eighth verses appear to have been spoken when Moses had the interview with Pharaoh mentioned in the preceding chapter; see Clarke's note on Exo 10:29. If therefore this chapter be connected with the preceding, as it should be, and the first three verses not only read in the past tense but also in a parenthesis, the sense will be much more distinct and clear than it now appears.