If I cast a spell from a staff such as the Staff of the Magi do I need to have and expend spell components?

@AdonisChristIf I cast a spell such as Arcane Lock from a staff such as the Staff of the Magi do I need to have and expend spell components? Yes, I believe so.

— Mike Mearls (@mikemearls) March 26, 2015

@ngsiverly @AdonisChristNo, DMG page 141: “requires no components, unless the item’s description says otherwise.” well, then there you go!

— Mike Mearls (@mikemearls) March 30, 2015