Flaming Sword
God placed the cherubim and a flaming sword that turned every way to guard the way to the tree of life, so that Adam and Eve could not eat of the tree of life. (Genesis 3:22-24)
Jonathan and David's covenant
The soul of Jonathan was knit to the soul of David as he finished speaking to Saul after his victory over Goliath. He made a covenant with David and gave him the robe he was wearing and his armor, sword, bow, and his belt. (1 Samuel 18:1-5)
Joab murders Amasa with a sword
Amasa meets Abishai and his men at the great stone that is in Gibeon on their way to stop Sheba's rebellion against King David. Joab was wearing a solder's garment under a belt with a sword in its sheath fastened on his thigh. As he went forward, it fell out. Joab asked Amasa, "Is it well with you, my brother?” Joab took Amasa by the beard with his right hand to kiss him, and Amasa did not observe the sword in Joab's hand. Joab struck him in the stomach and spilled his entrails to the ground without striking twice. Amasa died.