And afterward. The interposition of some not inconsiderable space of time seems to be implied. Menephthah resided partly at Memphis, partly at Zoan (Tanis). Moses and Aaron may have had to wait until he returned from his southern to his northern capital.
Moses and Aaron went in, and told Pharaoh. Aaron was, no doubt, the sole spokesman, but as he spoke for both, the plural is used. Thus saith the Lord God of Israel. Literally, "Thus saith Jehovah, God of Israel."
Pharaoh would understand Jehovah to be a proper name, parallel to his own Phthah, Ra, Ammon, etc. Let my people go. The rationale of the demand is given in Exodus 8:26. The Israelites could not offer their proper sacrificial animals in the presence of the Egyptians without the risk of provoking a burst of religious animosity, since among the animals would necessarily be some which all, or many, of the Egyptians regarded as sacred, and under no circumstances to be killed.
The fanaticism of the Egyptians on such occasions led to wars, tumults, and massacres. (See Plutarch, 'De Isid. et Osir.,' § 44.) To avoid this danger the "feast" must be held beyond the bounds of Egypt—in the adjacent "wilderness."