Saul's Father-in-law
Ahimaaz the son of Zadok
With Abiathar and Zadok, Ahimaaz brings the ark to David as he flees Absalom, but David has them stay in the city to be his eyes and ears
When King David was fleeing Absalom, Abiathar and Zadok came to him with all the Levites, bearing the ark of the covenant. They set down the ark until the people had all passed out of the city. King David told Zadok, "Are you not a seer? Go back to the city in peace, with your two sons, Ahimaaz your son, and Jonathan the son of Abiathar. See, I will wait at the fords of the wilderness until word comes from you to inform me." So Zadok and Abiathar carried the ark to Jerusalem and remained there. (2 Samuel 15:24-29)
Hushai sends word to David to flee Absalom
Hushai came to Zadok and Abiathar with a message for David: Ahithophel advised Absalom to let him take out only David with 12000 chosen men and to capture the rest, while Hushai advised for Absalom to personally lead all Israel to take out David and his men. Absalom and all the elders of Israel found Hushai's counsel better. Therefore, he wanted David to know, "Do not stay tonight at the fords of the wilderness, but by all means pass over, lest the king and all the people who are with him be swallowed up."
Jonathan and Ahimaaz waited at En-rogel, for they were not to be seen entering the city. A female servant was sent to tell them. A young man saw them and told Absalom. So both of them fled and came to the house of a man at Bahurim who had a well in his courtyard, and they hid in the well. The woman covered the well and scattered grain on it, so it was completely hidden. When Absalom's servants came to the woman at the house, she told them, “They have gone over the brook of water.” They couldn't find them and returned to Jerusalem, so the men came out of the well and went and told King David. David took the advice, and by daybreak, not one of his men had not passed the Jordan.
Ahimaaz insists to Joab upon delivering word of the battle against Absalom and Israel to King David
Ahimaaz the son of Zadok asked Joab, "Let me run and carry news to the king that the Lord has delivered him from the hand of his enemies." But Joab replied, "You are not to carry news today. You may carry news another day, but today you shall carry no news, because the king's son is dead.” Joab sent a Cushite instead. Ahimaaz said again, "Come what may, let me also run after the Cushite.” Joab asked, "Why will you run, my son, seeing that you will have no reward for the news?” Ahimaaz insisted, “Come what may, I will run.” So he said to him, “Run.” Then Ahimaaz ran by the way of the plain, and outran the Cushite.
David's watchman spotted two men running, the first ran like Ahimaaz. David knew a good man will bring good news. Ahimaaz cried, "All is well." He bowed before the king with his face to the earth and said, "Blessed be the Lord your God, who has delivered up the men who raised their hand against my lord the king." David asked, "Is it well with the young man Absalom?” Ahimaaz answered, “When Joab sent the king's servant, your servant, I saw a great commotion, but I do not know what it was.” And the king said, “Turn aside and stand here.” Ahimaaz stood aside and the Cushite arrived and told him Absalom was dead.
Why did Ahimaaz say he did not know the outcome for Absalom?
Was he lying or did he only know there was a great commotion?
And Joab said to him, “You are not to carry news today. You may carry news another day, but today you shall carry no news, because the king's son is dead.” - 2 Samuel 18:20
Joab flat-out told him Absalom was dead. Maybe he was overwhelmed with information on the battlefield and overly eager to share victory with David and missed important details, but I think he knew and was unwilling to say the brutal words to David. David has Ahimaaz stand aside, and the Cushite boldly delivers the news to David in an honoring way.
Solomon's Son-in-law
Ahimaaz is one of Solomon's twelve officers all over Israel who provided food for the king and his household. Each man had to make provision for one month in the year. He is over Naphtali. (1 Kings 4:7,15)