139. Seeking wealth is not a sinful act.

This verse (9:34) of the Quran cautions, the pursuit of wealth by men is punishable. 

This verse was revealed before the mandatory duty of zakat was promulgated. And those who made the necessary contribution of zakat on their earnings were not held punishable.

(Hadith Book Bukhari:1404)

The various verses of the Quran that encourage people to save and earn money can be seen in the verses 4:29, 4:32, 4:34, 9:103, 16:71, 17:6, 33:27, 62:10, 71:12, 73:20.