Let the young woman to whom I shall say, 'Please let down your jar that I may drink,' and who shall say, 'Drink, and I will water your camels' -- let her be the one whom you have appointed for your servant Isaac. By this[2] I shall know that you have shown steadfast love to my master."
And you shall hear what they say, and afterward your hands shall be strengthened to go down against the camp." Then he went down with Purah his servant to the outposts of the armed men who were in the camp.
He said, "But I will be with you, and this shall be the sign for you, that I have sent you: when you have brought the people out of Egypt, you shall serve God on this mountain."
And Isaiah said, "This shall be the sign to you from the LORD, that the LORD will do the thing that he has promised: shall the shadow go forward ten steps, or go back ten steps?"