Verse 18. Simon saw, etc. That is, he witnessed the extraordinary effects, the power of speaking in a miraculous manner, etc. See Barnes "Ac 8:15".

He offered them money. He had had a remarkable influence over the Samaritans, and he saw that the possession of this power would perpetuate and increase his influence. Men commonly employ the tricks of legerdemain for the purpose of making money; and it seems probable that such had been the design of Simon. He saw that if he could communicate to others this power, if he could confer on them the talent of speaking other languages, it might be turned to vast account, and he sought therefore to purchase it of the apostles. From this act of Simon we have derived our word simony, to denote the buying and selling of ecclesiastical preferment, or church offices, where religion is supported by the state. This act of Simon shows conclusively that he was influenced by improper motives in becoming connected with the church.

{d} "purchase" 1 Ti 6:5