Beshalach - בְּשַׁלַּ֣ח Shemot ~ Exodus Making Torah Personal 13:17 – 17:16

(17) Now when Pharaoh let the people go, God did not lead them by way of the land of the Philistines, although it was nearer; for God said, “The people may have a change of heart when they see war, and return to Egypt.” (18) So God led the people round about, by way of the wilderness at the Sea of Reeds.
Now the Israelites went up armed out of the land of Egypt.

כי אמר אלהים פן ינחם העם בראותם מלחמה ושבו מצרימה. ....Even G–d Himself made such a "fence" (safeguard) when He decided to let the Israelites travel via an indirect route so as to preclude the people from having second thoughts and wanting to return to Egypt.

דרך המדבר ים סוף, that they should march to the Sea of Reeds via the desert. On that route they would neither encounter travelers headed in the direction of Egypt, nor would they encounter travelers who had come from Egypt who could report that Pharaoh was going to chase them, until Pharaoh would actually catch up with them by which time a “voluntary” return to Egypt and slavery would not be of any advantage to them anymore, as their surrender would not then be acceptable to Pharaoh.

וחמושים עלו בני ישראל, and the Israelites went up armed, etc. It is possible that if the Israelites had not been armed they would not have listened to Moses' (G'd's) order to make an about turn away from the land of the Philistines so that they would not face an immediate battle. The Israelites therefore needed two reasons for not returning to Egypt at the slightest danger, i.e. possession of arms and the unlikelihood of having to use these arms. Combining these two factors would result in לא ינחם, that they would not have second thoughts.

What is the incident with a young boy? One time I was walking along the path, and I saw a young boy sitting at the crossroads. And I said to him: On which path shall we walk in order to get to the city? He said to me: This path is short and long, and that path is long and short. I walked on the path that was short and long. When I approached the city I found that gardens and orchards surrounded it, and I did not know the trails leading through them to the city. I went back and met the young boy again and said to him: My son, didn’t you tell me that this way is short? He said to me: And didn’t I tell you that it is also long? I kissed him on his head and said to him: Happy are you, O Israel, for you are all exceedingly wise, from your old to your young.

They set out from Succoth, and encamped at Etham, at the edge of the wilderness. The LORD went before them in a pillar of cloud by day, to guide them along the way, and in a pillar of fire by night, to give them light, that they might travel day and night. The pillar of cloud by day and the pillar of fire by night did not depart from before the people.

(6) He ordered his chariot and took his men with him; (7) he took six hundred of his picked chariots, and the rest of the chariots of Egypt, with officers in all of them. (8) The LORD stiffened the heart of Pharaoh king of Egypt, and he gave chase to the Israelites. As the Israelites were departing defiantly, (9) the Egyptians gave chase to them, and all the chariot horses of Pharaoh, his horsemen, and his warriors overtook them encamped by the sea, near Pi-hahiroth, before Baal-zephon. (10) As Pharaoh drew near, the Israelites caught sight of the Egyptians advancing upon them. Greatly frightened, the Israelites cried out to the LORD. (11) And they said to Moses, “Was it for want of graves in Egypt that you brought us to die in the wilderness? What have you done to us, taking us out of Egypt? (12) Is this not the very thing we told you in Egypt, saying, ‘Let us be, and we will serve the Egyptians, for it is better for us to serve the Egyptians than to die in the wilderness’?” (13) But Moses said to the people, “Have no fear! Stand by, and witness the deliverance which the LORD will work for you today; for the Egyptians whom you see today you will never see again. (14) The LORD will battle for you; you hold your peace!”

(1) Then Moses and the Israelites sang this song to the LORD. They said:
I will sing to the LORD, for He has triumphed gloriously;
Horse and driver He has hurled into the sea. (2) The LORD is my strength and might;
He is become my deliverance.
This is my God and I will enshrine Him;
The God of my father, and I will exalt Him.

(20) Then Miriam the prophetess, Aaron’s sister, took a timbrel in her hand, and all the women went out after her in dance with timbrels. (21) And Miriam chanted for them:
Sing to the LORD, for He has triumphed gloriously;
Horse and driver He has hurled into the sea.

מרים הנביאה, “Miriam the prophetess;” the word “prophetess” is used here to describe Miriam’s extraordinary ability to use words to express her feelings. According to Rash’bam, the word is also used as describing someone who preaches to people to behave morally and ethically correctly. Compare when God told Moses that his brother Aaron would be נביאך, which can hardly mean: “your prophet,” as Moses outclassed him in that department.

(8) Since it is the LORD,” Moses continued, “who will give you flesh to eat in the evening and bread in the morning to the full, because the LORD has heard the grumblings you utter against Him, what is our part? Your grumbling is not against us, but against the LORD!”