וַיֹּ֤אמֶר יְהוֹרָם֙ אֱסֹ֔ר וַיֶּאְסֹ֖ר רִכְבּ֑וֹ וַיֵּצֵ֣א יְהוֹרָ֣ם מֶֽלֶךְ־יִ֠שְׂרָאֵל וַאֲחַזְיָ֨הוּ מֶֽלֶךְ־יְהוּדָ֜ה אִ֣ישׁ בְּרִכְבּ֗וֹ וַיֵּֽצְאוּ֙ לִקְרַ֣את יֵה֔וּא וַיִּמְצָאֻ֔הוּ בְּחֶלְקַ֖ת נָב֥וֹת הַיִּזְרְעֵאלִֽי׃
And Joram said: ‘Make ready.’ And they made ready his chariot. And Joram king of Israel and Ahaziah king of Judah went out, each in his chariot, and they went out to meet Jehu, and found him in the portion of Naboth the Jezreelite.
Rashi
the blood of Jezreel To be understood according to its Aramaic translation: the blood of the house of Ahab, whom Jehu slew in Jezreel because they worshipped Baal, and he and his sons went afterwards and worshipped pagan deities; therefore, I account for them the blood of the house of Ahab as innocent blood.