2-45 Muhammad ibn al-Hassan ibn Ahmad ibn al-Walid - may God be pleased with him - narrated that Muhammad ibn al-Hassan al-Saffar quoted on the authority of Ahmad ibn Aba Abdullah, on the authority of Abdul Rahman ibn Himad, on the authority of Muhammad ibn Sin’an who linked it up through a chain of narrators to Abi Ja’far al-Baqir (MGB) that

the Imam (MGB) considered two forms of shopping to be bad: just picking the goods without checking them, and buying goods without having ever seen them.