“I once said to abu ‘Abd Allah (a.s.), ‘I marry a woman for one month and withhold a certain amount from her mahr (dower). He (the Imam) said, ‘Yes, you can do so for what is equal to her violation of the condition. If the violation is half of the month you can withhold one-half, if it is one-third then withhold one-third.’ Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad ibn ‘Isa from Ali ibn al-Hakam from ‘Umar ibn Hanzalah from abu ‘Abd Allah (a.s.), has narrated a similar Hadith.”