Narrated Thawban:
"When (the following) was revealed: And those who hoard up gold and silver... (9:34)" He said: "We were with the Messenger of Allah (ﷺ) during one of his journeys, so some of his Companions said: (This) has been revealed about gold and silver, if we knew which wealth was better then we would use it. So he (ﷺ) said: 'The most virtuous of it is a remembering tongue, a grateful heart, and a believing wife that helps him with his faith.'" (FR)
English reference (FR): Vol. 5, Book 44, Hadith 3094 (FR)
Arabic reference (FR): Book 47, Hadith 3377 (FR)