Israel sang a song to the well alone, and not to manna, because they had on several occasions railed against the heavenly food, and therefore God said: "I do not wish ye to find fault with manna, nor yet to have ye praise it now," and He would not permit them to sing a song of praise to manna.
The crushing of those concealed in the caves of the mountain at Arnon was only the beginning of the miracles God wrought for Israel during their conquest of the land. It was at Arnon, too, that Sihon, the king of the Amorites, and his people who, hardly a month after Aaron's death, rushed upon Israel, were completely destroyed by them. This Amorite king, and likewise Og, the king of Basham, were sons of Ahiah, whose father Shemhazai was one of the fallen angels. In accordance with his celestial origin Sihon was a giant who none could withstand, for he was of enormous stature, taller than any tower in all the world, his thigh-bone alone measuring eighteen cubits, according to the big cubit of that time. In spite of his huge size he was also fleet of foot, wherefore he was called Sihon, "foal," to indicate the celerity with which he moved, for his true name was Arad.