8-9 Muhammad ibn Ali Majiluyih - may God be pleased with him - narrated that Muhammad ibn Yahya al-Attar quoted Muhammad ibn Ahmad ibn Yahya ibn Imran al-Ash’ari, on the authority of Muhammad ibn Isa, on the authority of Abi Muhammad al-Ansari, on the authority of Aban ibn Uthman, “A man complained to Aba Abdullah as-Sadiq (MGB) and said, ‘The genies bother my family.’ The Imam (MGB) asked him, ‘How tall is the ceiling of your house?’ He answered, ‘It is ten Zar’as.’ The Imam (MGB) said, ‘You should not build a house with a ceiling higher than eight Zar’as. You should have the verse of the Throne (Ayat al-Kursi) inscribed as a decoration around it. Any room that is taller than eight Zar’as would be occupied by genies.’”