Then Jael Heber's wife took a nail of the tent, and took an hammer in her hand, and went softly unto him, and smote the nail into his temples, and fastened it into the ground: for he was fast asleep and weary. So he died. A nail of the tent - One of the spikes by which they fasten to the ground the cords which are attached to the cloth or covering.
He was fast asleep and weary - As he lay on one side, and was overwhelmed with sleep through the heat and fatigues of the day, the piercing of his temples must have in a moment put him past resistance.