Jonathan and Ahimaaz were staying at En-rogel because they couldn't be seen entering the city. A servant girl would come and tell them what was happening. Then they would go and let King David know.
The king also told Zadok the priest, “You understand the situation, don't you? Go back to the city safely with your son Ahimaaz, and also Jonathan, son of Abiathar. You and Abiathar take both of your sons back with you.
While he was speaking, Jonathan, son of Abiathar the priest, suddenly arrived. “Come on in,” said Adonijah. “A good man like you must be bringing good news.”
Adonijah invited all his brothers, the king's sons, and the king's officials of Judah, to come to the stone of Zoheleth, which is near En-rogel, where he sacrificed sheep, cattle and fattened calves.
From there it went to the border of Debir through the valley of Achor, and turned north towards Gilgal, opposite the heights of Adummim to the south of the valley. Then the boundary continued to the waters of En-shemesh and out to En-rogel.
and then down to the foot of the mountain that faces the valley of Ben-hinnom, at the north end of the valley of Rephaim. Then it went down the valley of Hinnom, along the slope near the Jebusite town, south towards En-rogel.