2 Kgs 10:6

וַיִּכְתֹּ֣ב אֲלֵיהֶם֩ סֵ֨פֶר שֵׁנִ֜ית לֵאמֹ֗ר אִם־לִ֨י אַתֶּ֜ם וּלְקֹלִ֣י אַתֶּ֣ם שֹׁמְעִ֗ים קְחוּ֙ אֶת־רָאשֵׁי֙ אַנְשֵׁ֣י בְנֵֽי־אֲדֹנֵיכֶ֔ם וּבֹ֧אוּ אֵלַ֛י כָּעֵ֥ת מָחָ֖ר יִזְרְעֶ֑אלָה וּבְנֵ֤י הַמֶּ֨לֶךְ֙ שִׁבְעִ֣ים אִ֔ישׁ אֶת־גְּדֹלֵ֥י הָעִ֖יר מְגַדְּלִ֥ים אוֹתָֽם׃

Then Jehu wrote them a second letter and said: “If you are on my side, and if you will obey me, then bring the heads of your master’s sons to me at Jezreel by this time tomorrow.” Now the sons of the king, seventy in all, were being brought up by the leading men of the city.