Anonymus Placentinus, Itinerarium 9,7-9 (ca. 570 A.D.)
In that part od the Jordan is the spring where Saint John used to baptize, and which is two miles from the Jordan, and Elijah was in that valley when the raven brought him bread and meat. The whole valley is full of hermits.

Iohannes Moschus, Pratum Spirituale,1
It is the place called Sapsas. Close by to the left is the torrent of Chorath, where Elijah the Thesbite was sent at the time of the drought, in front of the Jordan.

BIBLICAL BACKGROUND

1 Kings 17:2-6 The prophet Elijah at the wadi Cherit
The word of the Lord came to him, saying, "Go from here and turn eastward, and hide yourself by the Wadi Cherith, which is east of the Jordan. You shall drink from the wadi, and I have commanded the ravens to feed you there." So he went and did according to the word of the Lord; he went and lived by the Wadi Cherith, which is east of the Jordan. The ravens brought him bread and meat in the morning, and bread and meat in the evening; and he drank from the wadi. But after a while the wadi dried up, because there was no rain in the land.

2 King 2: 1-14 The prophet Elijah is taken up to heaven
Now when the Lord was about to take Elijah up to heaven by a whirlwind, Elijah and Elisha were on their way from Gilgal. Elijah said to Elisha, "Stay here; for the Lord has sent me as far as Bethel." But Elisha said, "As the Lord lives, and as you yourself live, I will not leave you." So they went down to Bethel. The company of prophets who were in Bethel came out to Elisha, and said to him, "Do you know that today the Lord will take your master away from you?" And he said, "Yes, I know; keep silent."
Elijah said to him, "Elisha, stay here; for the Lord has sent me to Jericho." But he said, "As the Lord lives, and as you yourself live, I will not leave you." So they came to Jericho. The company of prophets who were at Jericho drew near to Elisha, and said to him, "Do you know that today the Lord will take your master away from you?" And he answered, "Yes, I know; be silent."
Then Elijah said to him, "Stay here; for the Lord has sent me to the Jordan." But he said, "As the Lord lives, and as you yourself live, I will not leave you." So the two of them went on. Fifty men of the company of prophets also went, and stood at some distance from them, as they both were standing by the Jordan. Then Elijah took his mantle and rolled it up, and struck the water; the water was parted to the one side and to the other, until the two of them crossed on dry ground.
When they had crossed, Elijah said to Elisha, "Tell me what I may do for you, before I am taken from you." Elisha said, "Please let me inherit a double share of your spirit." He responded, "You have asked a hard thing; yet, if you see me as I am being taken from you, it will be granted you; if not, it will not." As they continued walking and talking, a chariot of fire and horses of fire separated the two of them, and Elijah ascended in a whirlwind into heaven. Elisha kept watching and crying out, "Father, father! The chariots of Israel and its horsemen!" But when he could no longer see him, he grasped his own clothes and tore them in two pieces.
He picked up the mantle of Elijah that had fallen from him, and went back and stood on the bank of the Jordan. He took the mantle of Elijah that had fallen from him, and struck the water, saying, "Where is the Lord, the God of Elijah?" When he had struck the water, the water was parted to the one side and to the other, and Elisha went over.

Luk. 3:2-14 The preaching of John the Baptist
The word of God came to John son of Zechariah in the wilderness. He went into all the region around the Jordan, proclaiming a baptism of repentance for the forgiveness of sins, as it is written in the book of the words of the prophet Isaiah, "The voice of one crying out in the wilderness: 'Prepare the way of the Lord, make his paths straight. Every valley shall be filled, and every mountain and hill shall be made low, and the crooked shall be made straight, and the rough ways made smooth; and all flesh shall see the salvation of God.'"
John said to the crowds that came out to be baptized by him, "You brood of vipers! Who warned you to flee from the wrath to come? Bear fruits worthy of repentance. Do not begin to say to yourselves, 'We have Abraham as our ancestor'; for I tell you, God is able from these stones to raise up children to Abraham. Even now the ax is lying at the root of the trees; every tree therefore that does not bear good fruit is cut down and thrown into the fire." And the crowds asked him, "What then should we do?" In reply he said to them, "Whoever has two coats must share with anyone who has none; and whoever has food must do likewise." Even tax collectors came to be baptized, and they asked him, "Teacher, what should we do?" He said to them, "Collect no more than the amount prescribed for you." Soldiers also asked him, "And we, what should we do?" He said to them, "Do not extort money from anyone by threats or false accusation, and be satisfied with your wages."

John 1:19-28 The witness of John the Baptist
This is the testimony given by John when the Jews sent priests and Levites from Jerusalem to ask him, "Who are you?" He confessed and did not deny it, but confessed, "I am not the Messiah." And they asked him, "What then? Are you Elijah?" He said, "I am not." "Are you the prophet?" He answered, "No." Then they said to him, "Who are you? Let us have an answer for those who sent us. What do you say about yourself?" He said, "I am the voice of one crying out in the wilderness, 'Make straight the way of the Lord,'" as the prophet Isaiah said.
Now they had been sent from the Pharisees. They asked him, "Why then are you baptizing if you are neither the Messiah, nor Elijah, nor the prophet?" John answered them, "I baptize with water. Among you stands one whom you do not know, the one who is coming after me; I am not worthy to untie the thong of his sandal." This took place in Bethany across the Jordan where John was baptizing.