171 Now there was a man of the hill-country of Ephraim named Micah. 2 And he said to his mother, The eleven hundred shekels of silver which were taken from you, about which you took an oath and said in my hearing, I have given this silver to the Lord from my hand for myself, to make a pictured image and a metal image: see, I have the silver, for I took it: so now I will give it back to you. And his mother said, May the blessing of the Lord be on my son. 3 And he gave back the eleven hundred shekels of silver to his mother, and his mother said, I have made the silver holy to the Lord from me for my son, to make a pictured image and a metal image. 4 So he gave the silver back to his mother. Then his mother took two hundred shekels of silver and gave them to a metal-worker who made a pictured image and a metal image from them: and it was in the house of Micah.
Matthew Henry's Commentary on Judges 17:1-4
Commentary on Judges 17:1-6
(Read Judges 17:1-6)
What is related in this, and the rest of the chapters to the end of this book, was done soon after the death of Joshua: see Judges 20:28. That it might appear how happy the nation was under the Judges, here is showed how unhappy they were when there was no Judge. The love of money made Micah so undutiful to his mother as to rob her, and made her so unkind to her son, as to curse him. Outward losses drive good people to their prayers, but bad people to their curses. This woman's silver was her god, before it was made into a graven or a molten image. Micah and his mother agreed to turn their money into a god, and set up idol worship in their family. See the cause of this corruption. Every man did that which was right in his own eyes, and then they soon did that which was evil in the sight of the Lord.