17 But Sisera fled away on foot to the tent of Jael, the wife of Heber the Kenite, for there was peace between Jabin the king of Hazor and the house of Heber the Kenite. 18 And Jael came out to meet Sisera and said to him, "Turn aside, my lord; turn aside to me; do not be afraid." So he turned aside to her into the tent, and she covered him with a rug. 19 And he said to her, "Please give me a little water to drink, for I am thirsty." So she opened a skin of milk and gave him a drink and covered him. 20 And he said to her, "Stand at the opening of the tent, and if any man comes and asks you, 'Is anyone here?' say, 'No.'" 21 But Jael the wife of Heber took a tent peg, and took a hammer in her hand. Then she went softly to him and drove the peg into his temple until it went down into the ground while he was lying fast asleep from weariness. So he died.
Matthew Henry's Commentary on Judges 4:17-21
Commentary on Judges 4:17-24
(Read Judges 4:17-24)
Sisera's chariots had been his pride and his confidence. Thus are those disappointed who rest on the creature; like a broken reed, it not only breaks under them, but pierces them with many sorrows. The idol may quickly become a burden, Isaiah 46:1; what we were sick for, God can make us sick of. It is probable that Jael really intended kindness to Sisera; but by a Divine impulse she was afterwards led to consider him as the determined enemy of the Lord and of his people, and to destroy him. All our connexions with God's enemies must be broken off, if we would have the Lord for our God, and his people for our people. He that had thought to have destroyed Israel with his many iron chariots, is himself destroyed with one iron nail. Thus the weak things of the world confound the mighty. The Israelites would have prevented much mischief, if they had sooner destroyed the Canaanites, as God commanded and enabled them: but better be wise late, and buy wisdom by experience, than never be wise.