The phrase "go to reward" can be replaced by a variety of synonyms, depending on the context. For example, you might say "reap the benefits" or "enjoy the fruits of one's labor" to imply that someone has worked hard to earn a reward. Alternately, you could use more formal language and say that someone "deserves a prize" or "merits recognition." If you're talking about a spiritual or religious reward, you might speak of "eternal salvation" or "divine favor." Other synonyms for "go to reward" might include "earn a bonus," "gain a prize," or "win a trophy." Regardless of which words you choose, the message should be clear: someone has done something worthy of being recognized and rewarded.