171 There was a man in the hill country of Ephraim whose name was Micah. 2 He said to his mother, "The eleven hundred pieces of silver that were taken from you, about which you uttered a curse, and even spoke it in my hearing,-that silver is in my possession; I took it; but now I will return it to you." And his mother said, "May my son be blessed by the Lord!" 3 Then he returned the eleven hundred pieces of silver to his mother; and his mother said, "I consecrate the silver to the Lord from my hand for my son, to make an idol of cast metal." 4 So when he returned the money to his mother, his mother took two hundred pieces of silver, and gave it to the silversmith, who made it into an idol of cast metal; 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.