171 And there is a man of the hill-country of Ephraim, and his name 'is' Micah, 2 and he saith to his mother, 'The eleven hundred silverlings which have been taken of thine, and 'of which' thou hast sworn, and also spoken in mine ears; lo, the silver 'is' with me, I have taken it;' and his mother saith, 'Blessed 'is' my son of Jehovah.' 3 And he giveth back the eleven hundred silverlings to his mother, and his mother saith, 'I had certainly sanctified the silver to Jehovah, from my hand, for my son, to make a graven image, and a molten image; and now, I give it back to thee.' 4 And he giveth back the money to his mother, and his mother taketh two hundred silverlings, and giveth them to a refiner, and he maketh them a graven image, and a molten image, and it is 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.