“Sisera had fled on foot to the tent of Jael, the wife of Heber the Kenite. There was peace between King Jabin of Hazor and the clan of Heber the Kenite. Jael came out to meet Sisera. She said to him. ‘Turn aside, my lord, turn aside to me. Have no fear.’ So he turned aside to her into the tent. She covered him with a rug. Then he said to her. ‘Please give me a little water to drink. I am thirsty.’ So she opened a skin of milk and gave him a drink and covered him. He said to her. ‘Stand at the entrance of the tent. If anybody comes and asks you. ‘Is anyone here?’ say, No.’ But Jael the wife of Heber took a tent peg and a hammer in her hand. She went softly to him. She then drove the peg into his temple, until it went down into the ground, as he was lying fast asleep from weariness. So he died. Then as Barak came in pursuit of Sisera, Jael went out to meet him. She said to him. ‘Come! I will show you the man whom you are seeking.’ So he went in to her tent. There was Sisera lying dead with the tent peg in his temple.”
This is a very colorful description of how Sisera died. Jael, the wife of Heber the Kenite invited Sisera into her tent. She gave him something to drink. This is the Heber mentioned earlier in this chapter. When Sisera fell asleep, Jael drove a tent peg into his temple and killed him. Thus, the woman Jael, not the man Barak killed Sisera. She then flagged down Barak and showed him what she has done.