If you cast from a Staff of Power does concentration come from you or the staff?

@JeremyECrawford If you cast a spell such as Wall of Force from a Staff of Power does concentration come from you or the staff? #WOTCstaff

— Aryana (@aryanarush) March 10, 2017

Casting a spell from a magic item? See the section on spells in "Activating a Magic Item" (DMG, 141). #DnD https://t.co/DAPk41ySah

— Jeremy Crawford (@JeremyECrawford) March 10, 2017