It was narrated that Thawbân said: “When the Verse concerning silver and gold was revealed, they said: 'What kind of wealth should we acquire? 'Umar said: 'I will tell you about that.' So he rode on his camel and caught up with the Prophet P.B.U.H, and I followed him. He said: '0 Messenger of Allah, what kind of wealth should we acquire?' He said: 'Let one of you acquire a thankful heart, a tongue that remembers Allah and a believing wife who will help him with regard to the Hereafter.'" (Hasan)