Exodus 4:1 - 9 - Moses answered, "But, behold, they will not believe me, nor listen to my voice; for they will say, `Yahweh has not appeared to you.'" Yahweh said to him, "What is that in your hand?" He said, "A rod." He said, "Throw it on the ground." He threw it on the ground, and it became a snake; and Moses ran away from it. Yahweh said to Moses, "Stretch out your hand, and take it by the tail." He stretched out his hand, and took hold of it, and it became a rod in his hand. "That they may believe that Yahweh, the God of their fathers, the God of Abraham, the God of Isaac, and the God of Jacob, has appeared to you." Yahweh said furthermore to him, "Now put your hand inside your cloak." He put his hand inside his cloak, and when he took it out, behold, his hand was leprous, as white as snow. He said, "Put your hand inside your cloak again." He put his hand inside his cloak again, and when he took it out of his cloak, behold, it had turned again as his other flesh. "It will happen, if they will neither believe you nor listen to the voice of the first sign, that they will believe the voice of the latter sign. It will happen, if they will not believe even these two signs, neither listen to your voice, that you shall take of the water of the river, and pour it on the dry land. The water which you take out of the river will become blood on the dry land."
Matthew 16:3 - In the morning, `It will be foul weather today, for the sky is red and threatening.' Hypocrites! You know how to discern the appearance of the sky, but you can't discern the signs of the times!
1 Kings 13:3 - 5 - He gave a sign the same day, saying, "This is the sign which Yahweh has spoken: Behold, the altar will be split apart, and the ashes that are on it will be poured out." It happened, when the king heard the saying of the man of God, which he cried against the altar in Bethel, that Jeroboam put out his hand from the altar, saying, "Seize him!" His hand, which he put out against him, dried up, so that he could not draw it back again to himself. The altar also was split apart, and the ashes poured out from the altar, according to the sign which the man of God had given by the word of Yahweh.
Genesis 15:8 - 17 - He said, "Lord Yahweh, how will I know that I will inherit it?" He said to him, "Bring me a heifer three years old, a female goat three years old, a ram three years old, a turtledove, and a young pigeon." He brought him all of these, and divided them in the middle, and laid each half opposite the other; but he didn't divide the birds. The birds of prey came down on the carcasses, and Abram drove them away. When the sun was going down, a deep sleep fell on Abram. Now terror and great darkness fell on him. He said to Abram, "Know for sure that your seed will live as foreigners in a land that is not theirs, and will serve them. They will afflict them four hundred years. I will also judge that nation, whom they will serve. Afterward they will come out with great wealth, but you will go to your fathers in peace. You will be buried in a good old age. In the fourth generation they will come here again, for the iniquity of the Amorite is not yet full." It came to pass that, when the sun went down, and it was dark, behold, a smoking furnace, and a flaming torch passed between these pieces.