Kommentar zu Tehillim 106:7

and they were rebellious by the sea They had little faith; they said, “Just as we ascend from here, from this side, the Egyptians also are ascending from another side, and they will come after us,” until the Holy One, blessed be He, hinted to the sea, and it vomited them out onto the dry land. Then (Exod. 14:30) “Israel saw the Egyptians dead on the seashore.” Therefore (ibid. verse 31) “they believed in the Lord,” but in the beginning, they did not believe. I found this.