Any that breathed, i.e. any of the males of that family. See Deuteronomy 20:16 Joshua 10:40. According unto the saying of the Lord: so God overruled Baasha's ambition and cruelty, to fulfil his own counsel and prediction.
Related Commentaries of 1 Kings 15:29
1 Kings 15:29
29 And it came to pass, when he reigned, that he smote all the house of Jeroboam; he left not to Jeroboam any that breathed, until he had destroyed him, according unto the saying of the LORD, which he spake by his servant Ahijah the Shilonite: