Following are a number of back-translations as well as a sample translation for translators of 2 Kings 10:6:

• Kupsabiny: “Then, Jehu wrote a second letter, saying, ‘If you (plur.) are truly on my side, and you are accepting to follow my words, bring (plur.) tomorrow the heads of the sons of Ahab to come to Jezreel at a time like this one.’ Those seventy sons of the king were living/staying in the hands/authority of important people in the city who were guarding them.” (Source: Kupsabiny Back Translation)
• Newari: “Jehu wrote them another letter. "If you are on my side, if you will do like I say, come to me in Jezreel by this time tomorrow bringing the heads of the sons of King Ahab." The seventy sons of King Ahab had been cared for by the great men of Samaria.” (Source: Newari Back Translation)
• Hiligaynon: “Jehu responded to them with this letter: ‘If you (plur.) are on- my -side and ready to obey/follow me, cut-off the heads of the descendants Ahab and tomorrow [you (plur.)] bring their heads to me here in Jezreel, at this-same hour.’
  Now, the 70 descendants of King Ahab were-taken-care-of by honorable men of the city of Samaria from their childhood.” (Source: Hiligaynon Back Translation)
• English: “So Jehu sent a second letter to them, writing this: ‘If you are on my side/want to help me, and if you are ready to obey me, kill King Ahab’s descendants and cut off their heads and bring their heads to me here in Jezreel at this time tomorrow.’
  The seventy descendants of King Ahab were being brought up and supervised by the leaders of Samaria city.” (Source: Translation for Translators)