Gallows in the Bible

Esther 2:23 And when inquisition was made of the matter, it was found out; therefore they were both hanged on a tree: and it was written in the book of the chronicles before the king.
Esther 5:14 Then said Zeresh his wife and all his friends unto him, Let a gallows be made of fifty cubits high, and to morrow speak thou unto the king that Mordecai may be hanged thereon: then go thou in merrily with the king unto the banquet. And the thing pleased Haman; and he caused the gallows to be made.
Esther 6:4 And the king said, Who is in the court? Now Haman was come into the outward court of the king's house, to speak unto the king to hang Mordecai on the gallows that he had prepared for him.
Esther 7:9-10 And Harbonah, one of the chamberlains, said before the king, Behold also, the gallows fifty cubits high, which Haman had made for Mordecai, who had spoken good for the king, standeth in the house of Haman. Then the king said, Hang him thereon. 10 So they hanged Haman on the gallows that he had prepared for Mordecai. Then was the king's wrath pacified.
Esther 9:13 Then said Esther, If it please the king, let it be granted to the Jews which are in Shushan to do to morrow also according unto this day's decree, and let Haman's ten sons be hanged upon the gallows.
Esther 9:25 But when Esther came before the king, he commanded by letters that his wicked device, which he devised against the Jews, should return upon his own head, and that he and his sons should be hanged on the gallows.

Galatians 3:13 Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree: