"In a reply to the letter of Ishaq ibn Ya‘qub written by Haḍrat Wali al-‘Asr, the Imam of the Age (A). In the said letter Ishaq ibn Ya‘qub posed questions to the Imam (A) one of which is: 'What do we have to do in case of occurring social problems [al-hawadith al-waqi‘ah] during the period of occultation?' In reply to this question, the Imam (A) said: 'In case of occurring social problems, refer for guidance to those who relate from us, for they are my argument [hujjah] against you, and I am Allah’s argument against them.'"

SOURCE: A CURSORY GLANCE AT THE THEORY OF WILAYAT AL-FAQIH | AYATOLLAH MISBAH YAZDI (R)