Matthew Poole and continuators on Judges 4:17

17 Howbeit Sisera fled away on his feet 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.

For Women had their Tents apart from their Husbands, Gen. 24. 67. and 31. 33. And here he thought to lurk more securely than in her Husbands Tent.

Not a League or Covenant of Friendship, which they were forbidden to make with that cursed People; but onely a cessation of Hostilities, which he afforded them because they were a peaceable people, abhorring War, and wholly minding Pasturage, and were not Israelites, with whom his principal Quarrel was; and especially by Gods over-ruling disposal of his heart to favour them who were careful to keep themselves uncorrupted with Israel's Sins, and therefore are preserved from their Plagues.