Although from the infirmities and corruptions of our fallen nature, many of the early followers of the Lord, had more than one wife, yet, the Holy Ghost hath pointed out both the sin and folly of it; for, in every instance, we are taught what a trouble it produced in families; witness Abraham ' s household. Gen_16:2-5; Gen_21:9-11. But, that those indulgencies sprung out of the corruption of our poor fallen nature, is evident from what our blessed Lord hath said upon it. See Matthew 19:3-8. Gideon seems to have had such partiality to this son of the concubine, as Abraham had to Ishmael: for the name Abimelech, signifies my father a king. How opposite, in many instances, are the feelings of nature to those of grace. Genesis 17:18.
Related Commentaries of Judges 8:30
Judges 8:30-31
30 And Gideon had threescore and ten sons of his body begotten: for he had many wives.
31 And his concubine that was in Shechem, she also bare him a son, whose name he calledi Abimelech.