al-Minhal bin 'Amr al-Asadi المنهال بن عمرو الأسدي مولاهم الكوفي · The Book of Funerals

"Whoever follows the funeral of a Muslim man, seeking reward, and offers the prayer and buries him, will have two Qirats. And whoever offers the funeral prayer then goes back before the burial, then he returns with one Qirat of reward."