1-90 Ahmad ibn Muhammad ibn Yahya al-Attar - may God be pleased with him - narrated that his father quoted on the authority of Abi Sa’id al-Adamy, on the authority of Al-Hassan ibn al-Hussein al-Lu’lu’ee, on the authority of Muhammad ibn Sa’id ibn Qazvan, on the authority of Isma’il ibn Abi Zyad, on the authority of Aba Abdullah as-Sadiq (MGB), on the authority of his father (MGB), on the authority of his grandfather (MGB) that the Commander of the Faithful Imam Ali (MGB) said,

“Whoever wants to increase the good in his house should wash his hands before he eats.”