Doctrine & Covenants 127:4

Let ... all the works which I have appointed unto you be continued on and not cease; and let your diligence, and your perseverance, and patience, and your works be redoubled, and you shall in nowise lose your reward, saith the Lord of Hosts. And if they persecute you, so persecuted they the prophets and righteous men that were before you. For all this there is a reward in heaven.