How do we deal with ahadith making ziyara to Husayn obligatory?

On Ziyarat al-Arba’een

Is there evidence the Imams directly sanctioned latom?

On Chainless Books

Our Imams activities in Morocco

Imam al-Sadiq’s marriages to Abbasids and Umayyads

Shaykh al-Saduq on why Allah created the universe

Infallibility, per classical scholars