Exodus 9:19-21

"Now therefore send, hasten in thy cattle and all that thou hast in the field; for every man and beast that shall be found in the field, and shall not be brought home, the hail shall come down upon them, and they shall die. And he that feared the word of Jehovah among the servants of Pharaoh made his servants and his cattle flee into the houses: and he that regarded not the word of Jehovah left his servants and his cattle in the field."

The dreadful hail had been predicted in Exodus 9:18, but for the first time, there was here injected a means of escaping the plague for those who would heed the word of Jehovah. Jehovah had already made many converts in Egypt. There were many who knew that the God of the Hebrews was indeed the true God, and some of them heeded the warning. It is perhaps unwise to go as far as Esses did, who affirmed that those who did so, "were saved, not just from destruction by the hail, but they were saved for eternal life."[20] However, this could have been the source of that "mixed multitude of people" who accompanied Israel into the wilderness, all of whom were, potentially at least, subject to adoption into Israel in the same manner as Ruth, the Moabitess.