At-Tawbah · 9:41

41. March forth O believers, striving for the cause of Allah in hardship and in ease, whether you are young or old, striving with your wealth and selves, because going out and striving with your wealth and your selves is of more benefit in the life of this world and in the Afterlife than sitting at home and becoming attached to your wealth and persons. If you truly know this, then be eager to obey.