NET
21 Then Jael wife of Heber took a tent peg in one hand and a hammer in the other. She crept up on him, drove the tent peg through his temple into the ground while he was asleep from exhaustion, and he died.
Darby
21 And Jael Heber's wife took a tent-pin, and took the hammer in her hand, and went softly to him, and smote the pin into his temples, and it penetrated into the ground; for he had fallen into a deep sleep and was faint; and he died.
KJV
21 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.