וְגַ֣ם אַתָּ֣ה יָדַ֡עְתָּ אֵת֩ אֲשֶׁר־עָ֨שָׂה לִ֜י יוֹאָ֣ב בֶּן־צְרוּיָ֗ה אֲשֶׁ֣ר עָשָׂ֣ה לִשְׁנֵֽי־שָׂרֵ֣י צִבְא֣וֹת יִ֠שְׂרָאֵל לְאַבְנֵ֨ר בֶּן־נֵ֜ר וְלַעֲמָשָׂ֤א בֶן־יֶ֙תֶר֙ וַיַּ֣הַרְגֵ֔ם וַיָּ֥שֶׂם דְּמֵֽי־מִלְחָמָ֖ה בְּשָׁלֹ֑ם וַיִּתֵּ֞ן דְּמֵ֣י מִלְחָמָ֗ה בַּחֲגֹֽרָתוֹ֙ אֲשֶׁ֣ר בְּמָתְנָ֔יו וּֽבְנַעֲל֖וֹ אֲשֶׁ֥ר בְּרַגְלָֽיו׃
Moreover thou knowest also what Joab the son of Zeruiah did unto me, even what he did to the two captains of the hosts of Israel, unto Abner the son of Ner and unto Amasa the son of Jether, whom he slew, and shed the blood of war in peace, and put the blood of war upon his girdle that was about his loins, and in his shoes that were on his feet.
Tze'enah Ure'enah
“He conferred with Joab the son of Zeruiah, etc.” [1:7]. Adonijah spoke with Joab the son of Zeruiah. He agreed with Adonijah and wanted to make him king. Joab was one of David’s chieftains and had killed Abner,6II Samuel, 3:27. who was a warrior and a scholar.7J. Peah, 1.1. David did not want to kill Joab during his lifetime, but he left in his will to his son who would become king after his death, that he should take revenge against Joab.8I Kings, 2:5. Therefore, Joab wanted to associate himself with Adonijah and wanted to help make him king, in the expectation that Adonijah would have mercy on Joab and would not kill him, even though King David had asked it to be done. Joab had killed three people, Abner, Osias, and Absalom. Therefore, he wanted to flatter Adonijah. Abiathar the priest also agreed with making Adonijah king, because David had refused to make him high priest and made Zadok the high priest. Adonijah did not speak to Zadok the high priest or to Benaiah or to Nathan the prophet, or to Shimei, Rei, and David’s other warriors. None of them were with Adonijah.