Or HaChaim on Exodus 12:31/אור החיים על שמות י״ב:ל״א

1 ויקרא למשה ולאהרון לילה, "He called for Moses and Aaron at night, etc." The reason that the Torah repeats the word לילה, night, could be that Pharaoh was afraid that inasmuch as he had forbidden Moses and Aaron to see him again on pain of death (10,28), they would use this as an excuse not to see him, fearing it was a trap to give Pharaoh an excuse to execute them. By emphasising the word לילה Pharaoh indicated that he had only threatened them on "the day you will see my face, etc." Since it was night, they had no reason to be afraid. Alternatively, Pharaoh meant that seeing it was dark they would not see his face anyways, and his threat applied only to their seeing his face.

2One could also interpret this verse by viewing the word לילה as part of Moses' answer. Pharaoh called for Moses and Aaron, whereupon the latter responded that it was now night, i.e. not the time to conduct negotiations. Moses may have added that G'd had forbidden any of the Israelites to leave their houses during that night (12,22) until morning.

3Upon hearing this Pharaoh said: קומו צאו, "arise and depart." In other words Pharaoh freed the Israelites by this proclamation. The expression קומו, "arise," may even contain a hint of Pharaoh's granting the Israelites a "higher status" than they had possessed heretofore. Bereshit Rabbah 58,8 explains Genesis 23,17 where the field and cave of Machpelah are described as ויקם, having arisen. Whereas previously, before Abraham's purchase, the field and cave belonged to a low-life such as Efron, the field and cave "rose" to a higher status by becoming the property of a man of the calibre of Abraham. At any rate, Pharaoh believed that by declaring the Israelites a free people without any further ado, he could free himself of the plague of the dying of the firstborn. If they did not leave immediately, their continued stay could not be blamed on him.

4Another meaning of the words קומו צאו is that it is an accusation. Seeing that Moses and Aaron had refused to come to Pharaoh, he called upon them to rise from their beds for their own benefit, i.e. "the reason I have called you was so that you should leave the country." Accordingly, Moses and Aaron explained that their failure to get up from their beds immediately was not lack of respect for the king but לילה, G'd had ordered them not to leave their houses during that night.

5גם אתם גם בני ישראל, "both you and the children of Israel." Why did Pharaoh say גם, also, already before mentioning that Moses and Aaron were to leave? Besides, why did Moses and Aaron need Pharaoh's permission to leave that he said to them: "depart from amongst my people?" They were not his prisoners! Perhaps the wording of Pharaoh's dismissal reveals that subconsciously he had always wanted to arrest Moses and Aaron. When he now gave orders that the Israelites could leave, he had to first reverse his thinking about detaining Moses and Aaron individually. None of this would have been discernible if the word גם had been used only in connection with the departure of the Israelites as a people.

6Still another meaning of this verse is that Pharaoh not only discharged the Israelites but he expelled them. The words גם אתם may then be interpreted thus: "Although you are no longer under my control as slaves, I do not want you to reside in my country any longer." This was a new element. Now the point had been reached of which G'd had said to Moses in 11,1: "when he will finally discharge you completely he will not only discharge you but he will expel you." The words גם בני ישראל refer to the women and the children; the word גם, also, in connection with גם צאנכם in verse 32 refers to the other items such as the animals Pharaoh himself was to supply (compare 10,25).