From Sahih Muslim (Hadith 2196):
Thauban, the freed slave of the Messenger of Allah (ﷺ) reported Allah's Messenger (ﷺ) as saying:He who offered prayer for the dead, for him is the reward of one qirat, and he who attended its burial, he would have two qirats as his reward. And qirat is equivalent to Uhud
Reference: Muslim 2196