2 Samuel 17:15-17

15Then Hushai said to Zadok and Abiathar the priests, “This is the advice that Ahithophel gave to Absalom and the elders of Israel, and this is the advice that I have given.

16Now then, send word quickly and tell David, ‘Do not spend the night at the fords [on the west side of the Jordan] in the wilderness, but by all means cross over [to the east side of the river], or else the king and all the people with him will be destroyed [if Ahithophel is allowed by Absalom to lead an attack].’ ”

17Now Jonathan and Ahimaaz [the priests’ sons] were staying at En-rogel, and a maidservant [appearing to go for water] would go and tell them [what was happening], and they would go [secretly] and inform King David; for they could not [allow themselves to] be seen coming into the city [of Jerusalem].