Exodus 6:6
6 Say therefore to the people of Israel, m‘I am the Lord, and nI will bring you out from under the burdens of the Egyptians, and I will deliver you from slavery to them, and oI will redeem you with an outstretched arm and with great acts of judgment.
Exodus 15:23
23 When they came to bMarah, they could not drink the water of Marah because it was bitter; therefore it was named Marah.1