Reward of giving Ghusl to a corpse

1. My father رحمه الله said: it was narrated to me by Sa’d b. Abdillah from al-Haytham b. Abi Masruq al-Hindi from al-Hassan b. Mahbub from Abdillah b. Ghalib from Sa’d al-Iskafi from Abi Ja’far عليه السلام who said: “If a believer gives ghusl to a dead believer and recites: Allaahumma haadhaa badanu a’bdikal mu-mini wa qad akharajta rooh’ahu minhu wa farraqta bainahumaa fa-a’fwaka a’fwak Allah forgives the sins committed by him in one year except for the greater sins.”