Exodus 15:22-27

22 So Moses brought up the children of Israel from the Red Sea, and brought them into the wilderness of Sur; and they went three days in the wilderness, and found no water to drink.
23 and they came to Merrha, and could not drink of Merrha, for it was bitter; therefore he named the name of that place, Bitterness.
24 And the people murmured against Moses, saying, What shall we drink?
25 And Moses cried to the Lord, and the Lord shewed him a tree, and he cast it into the water, and the water was sweetened: there he established to him ordinances and judgments, and there he proved him,
26 and said, If thou wilt indeed hear the voice of the Lord thy God, and do things pleasing before him, and wilt hearken to his commands, and keep all his ordinances, no disease which I have brought upon the Egyptians will I bring upon thee, for I am the Lord thy God that heals thee.
27 And they came to Aelim, and there were there twelve fountains of water, and seventy stems of palm-trees; and they encamped there by the waters.

Exodus 15:22-27 Meaning and Commentary

INTRODUCTION TO EXODUS 15

This chapter contains the song of Moses, and of the children of Israel, on the banks of the Red sea; in which they celebrate their passage through it, the destruction of Pharaoh and his host in it, and the glory of the divine perfections displayed therein, interspersed with prophetic hints of things future, Ex 15:1-19 which same song was sung by the women, with Miriam at the head of them, attended with timbrels and dances, Ex 15:20,21, an account is given of the march of the children of Israel from the Red sea to the wilderness of Shur, and of the bitter waters found at Marah, which occasioned a murmuring, and of their being made sweet by casting a tree into them, Ex 15:22-25 when they were told by the Lord, that if they would yield obedience to his commandments, they should be free from the diseases the Egyptians had been afflicted with, Ex 15:26, and the chapter is concluded with their coming to Elim, where they found twelve wells of water, and seventy palm trees, and there encamped, Ex 15:27.

The Brenton translation of the Septuagint is in the public domain.