Exodus 9:13

And the Lord said unto Moses, rise up early in the morning, and stand before Pharaoh,.... Who it seems used to rise early in the morning, and so was a fit time to meet with him, and converse with him; it might be one of the mornings in which he used to go to the water early, though not mentioned, unless that was every morning:

and say unto him, thus saith the Lord God of the Hebrews, let my people go, that they may serve me; thus had he line upon line, and precept upon precept, so that he was the more inexcusable, see Exodus 9:1.