Adam Clarke on Exodus 5:1

And afterward Moses and Aaron went - This chapter is properly a continuation of the preceding, as the succeeding is a continuation of this; and to preserve the connection of the facts they should be read together.

How simply, and yet with what authority, does Moses deliver his message to the Egyptian king! Thus saith Jehovah, God of Israel, Let my people go. It is well in this, as in almost every other case where יהוה Jehovah occurs, to preserve the original word: our using the word Lord is not sufficiently expressive, and often leaves the sense indistinct.