Kings IV 10:7

7 And it came to pass, when the letter came to them, that they took the king's sons, and slew them, seventy men, and put their heads in baskets, and sent them to him at Jezrael.

Kings IV 10:7 In-Context

5 So they that were over the house, and they that were over the city, and the elders and the guardians, sent to Ju, saying, We also thy servants, and whatsoever thou shalt say to us we will do; we will not make man king: we will do that which is right in thine eyes.
6 And Ju wrote them a second letter, saying, If ye for me, and hearken to my voice, take the heads of the men your master's sons, and bring to me at this time to-morrow in Jezrael. Now the sons of the king were seventy men; these great men of the city brought them up.
7 And it came to pass, when the letter came to them, that they took the king's sons, and slew them, seventy men, and put their heads in baskets, and sent them to him at Jezrael.
8 And a messenger came and told , saying, They have brought the heads of the king's sons. And he said, Lay them two heaps by the door of the gate until the morning.
9 And the morning came, and he went forth, and stood, and said to all the people, Ye are righteous: behold, I conspired against my master, and slew him: but who slew all these?

The Brenton translation of the Septuagint is in the public domain.