Does Sword of Vengeance give +1 always or only while attuned?

@BrailSaysDoes Sword of Vengeance give +1 always or only while attuned? " Does Sword of Vengeance give +1 always or only while attuned?" @mikemearls

Only while attuned.

— Jeremy Crawford (@JeremyECrawford) January 10, 2015