Hadith.557 - Imam (as) said: "Prayer, fasting, pilgrimage, charity, righteousness, and supplication enter upon the deceased in their grave, and the reward is written for both the one who performs these deeds and the deceased."
Man Lā Yaḥḍuruh al-Faqīh #1406Hadith.2972 - Imam (as) said:
"Prayer, fasting, Hajj, charity, and emancipation (of slaves) reach the deceased in their grave."