“Once I was sitting in the presence of abu ‘Abd Allah (a.s.), when Mu’ammar al-Zayyat said, ‘We buy oil in Ziqaq (a certain container), they compensate it for deficit because of Ziqaq. He (the Imam) said, ‘If it comes extra as well as in deficit, it is not harmful but if it comes extra and no deficit, then you must not go close to it.’”