2-92 (The compiler of the book narrated) that his father - may God be pleased with him - narrated that Muhammad ibn Yahya al-Attar quoted Muhammad ibn Ahmad, on the authority of Aba Abdullah al-Razi, on the authority of Ali ibn Asbat, on the authority of Al-Hikam ibn Meskin,

“I heard Aba Abdullah as-Sadiq (MGB) say, ‘Eating soap would weaken the knees and spoil the semen.’”